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V:X/RE:X/U:X"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53863"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1088995","reference_id":"1088995","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1088995"},{"reference_url":"https://github.com/advisories/GHSA-vp6v-whfm-rv3g","reference_id":"GHSA-vp6v-whfm-rv3g","reference_type":"","scores":[],"url":"https://github.com/advisories/GHSA-vp6v-whfm-rv3g"},{"reference_url":"https://usn.ubuntu.com/7444-1/","reference_id":"USN-7444-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/7444-1/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/187305?format=json","purl":"pkg:pypi/matrix-synapse@1.120.1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/matrix-synapse@1.120.1"}],"aliases":["CVE-2024-53863","GHSA-vp6v-whfm-rv3g"],"risk_score":null,"exploitability":null,"weighted_severity":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-fzu5-7rfv-qfgx"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/9283?format=json","vulnerability_id":"VCID-g7rm-55dm-tybk","summary":"Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new \"leaky bucket\" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data to be cached.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2024-37302","reference_id":"","reference_type":"","scores":[{"value":"0.00568","scoring_system":"epss","scoring_elements":"0.68844","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2024-37302"},{"reference_url":"https://github.com/element-hq/synapse","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/element-hq/synapse"},{"reference_url":"https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-03T18:55:21Z/"}],"url":"https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2024-37302","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-37302"},{"reference_url":"https://github.com/advisories/GHSA-4mhg-xv73-xq2x","reference_id":"GHSA-4mhg-xv73-xq2x","reference_type":"","scores":[],"url":"https://github.com/advisories/GHSA-4mhg-xv73-xq2x"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/187298?format=json","purl":"pkg:pypi/matrix-synapse@1.106","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/matrix-synapse@1.106"},{"url":"http://public2.vulnerablecode.io/api/packages/43088?format=json","purl":"pkg:pypi/matrix-synapse@1.106.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-9r6h-dqus-mbag"},{"vulnerability":"VCID-fzu5-7rfv-qfgx"},{"vulnerability":"VCID-k4kh-v8t1-wqfg"},{"vulnerability":"VCID-nmcr-v864-nkde"},{"vulnerability":"VCID-t1ed-3zjj-eude"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/matrix-synapse@1.106.0"}],"aliases":["CVE-2024-37302","GHSA-4mhg-xv73-xq2x","PYSEC-2024-286"],"risk_score":3.4,"exploitability":"0.5","weighted_severity":"6.8","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-g7rm-55dm-tybk"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/292373?format=json","vulnerability_id":"VCID-k4kh-v8t1-wqfg","summary":"","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-30355","reference_id":"","reference_type":"","scores":[{"value":"0.13201","scoring_system":"epss","scoring_elements":"0.94254","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-30355"},{"reference_url":"https://github.com/element-hq/synapse","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/element-hq/synapse"},{"reference_url":"https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-27T13:47:41Z/"}],"url":"https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389"},{"reference_url":"https://github.com/element-hq/synapse/releases/tag/v1.127.1","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-27T13:47:41Z/"}],"url":"https://github.com/element-hq/synapse/releases/tag/v1.127.1"},{"reference_url":"https://github.com/element-hq/synapse/security/advisories/GH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invalid device keys degrade federation functionality\nLack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-61672.json","reference_id":"","reference_type":"","scores":[{"value":"5.4","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-61672.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-61672","reference_id":"","reference_type":"","scores":[{"value":"0.00046","scoring_system":"epss","scoring_elements":"0.14639","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-61672"},{"reference_url":"https://github.com/element-hq/synapse","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/element-hq/synapse"},{"reference_url":"https://github.com/element-hq/synapse/commit/26aaaf9e48fff80cf67a20c691c75d670034b3c1","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-15T16:10:58Z/"}],"url":"https://github.com/element-hq/synapse/commit/26aaaf9e48fff80cf67a20c691c75d670034b3c1"},{"reference_url":"https://github.com/element-hq/synapse/commit/7069636c2d6d1ef2022287addf3ed8b919ef2740","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-15T16:10:58Z/"}],"url":"https://github.com/element-hq/synapse/commit/7069636c2d6d1ef2022287addf3ed8b919ef2740"},{"reference_url":"https://github.com/element-hq/synapse/pull/17097","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-15T16:10:58Z/"}],"url":"https://github.com/element-hq/synapse/pull/17097"},{"reference_url":"https://github.com/element-hq/synapse/releases/tag/v1.138.3","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-15T16:10:58Z/"}],"url":"https://github.com/element-hq/synapse/releases/tag/v1.138.3"},{"reference_url":"https://github.com/element-hq/synapse/releases/tag/v1.138.4","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/element-hq/synapse/releases/tag/v1.138.4"},{"reference_url":"https://github.com/element-hq/synapse/releases/tag/v1.139.1","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-15T16:10:58Z/"}],"url":"https://github.com/element-hq/synapse/releases/tag/v1.139.1"},{"reference_url":"https://github.com/element-hq/synapse/releases/tag/v1.139.2","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/element-hq/synapse/releases/tag/v1.139.2"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1117854","reference_id":"1117854","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1117854"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2402525","reference_id":"2402525","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2402525"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61672","reference_id":"CVE-2025-61672","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61672"},{"reference_url":"https://github.com/advisories/GHSA-fh66-fcv5-jjfr","reference_id":"GHSA-fh66-fcv5-jjfr","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-fh66-fcv5-jjfr"},{"reference_url":"https://github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfr","reference_id":"GHSA-fh66-fcv5-jjfr","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"5.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-15T16:10:58Z/"}],"url":"https://github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfr"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/69566?format=json","purl":"pkg:pypi/matrix-synapse@1.138.3","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/matrix-synapse@1.138.3"},{"url":"http://public2.vulnerablecode.io/api/packages/69567?format=json","purl":"pkg:pypi/matrix-synapse@1.139.1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/matrix-synapse@1.139.1"}],"aliases":["CVE-2025-61672","GHSA-fh66-fcv5-jjfr"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-nmcr-v864-nkde"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/9284?format=json","vulnerability_id":"VCID-nmup-uep4-b7hw","summary":"Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated remote participants to trigger a download and caching of remote media from a remote homeserver to the local media repository. Such content then also becomes available for download from the local homeserver in an unauthenticated way. The implication is that unauthenticated remote adversaries can use this functionality to plant problematic content into the media repository. Synapse 1.106 introduces a partial mitigation in the form of new endpoints which require authentication for media downloads. The unauthenticated endpoints will be frozen in a future release, closing the attack vector.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2024-37303","reference_id":"","reference_type":"","scores":[{"value":"0.00342","scoring_system":"epss","scoring_elements":"0.57075","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2024-37303"},{"reference_url":"https://github.com/element-hq/synapse","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/element-hq/synapse"},{"reference_url":"https://github.com/element-hq/synapse/security/advisories/GHSA-gjgr-7834-rhxr","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-03T18:49:29Z/"}],"url":"https://github.com/element-hq/synapse/security/advisories/GHSA-gjgr-7834-rhxr"},{"reference_url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3916","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-03T18:49:29Z/"}],"url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3916"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2024-37303","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-37303"},{"reference_url":"https://github.com/advisories/GHSA-gjgr-7834-rhxr","reference_id":"GHSA-gjgr-7834-rhxr","reference_type":"","scores":[],"url":"https://github.com/advisories/GHSA-gjgr-7834-rhxr"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/187298?format=json","purl":"pkg:pypi/matrix-synapse@1.106","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/matrix-synapse@1.106"},{"url":"http://public2.vulnerablecode.io/api/packages/43088?format=json","purl":"pkg:pypi/matrix-synapse@1.106.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-9r6h-dqus-mbag"},{"vulnerability":"VCID-fzu5-7rfv-qfgx"},{"vulnerability":"VCID-k4kh-v8t1-wqfg"},{"vulnerability":"VCID-nmcr-v864-nkde"},{"vulnerability":"VCID-t1ed-3zjj-eude"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/matrix-synapse@1.106.0"}],"aliases":["CVE-2024-37303","GHSA-gjgr-7834-rhxr","PYSEC-2024-287"],"risk_score":2.4,"exploitability":"0.5","weighted_severity":"4.8","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-nmup-uep4-b7hw"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/9104?format=json","vulnerability_id":"VCID-ry9q-34p9-auh6","summary":"Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2024-31208","reference_id":"","reference_type":"","scores":[{"value":"0.03089","scoring_system":"epss","scoring_elements":"0.87015","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2024-31208"},{"reference_url":"https://github.com/element-hq/synapse","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/element-hq/synapse"},{"reference_url":"https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-04-23T19:13:09Z/"}],"url":"https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a"},{"reference_url":"https://github.com/element-hq/synapse/releases/tag/v1.105.1","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-04-23T19:13:09Z/"}],"url":"https://github.com/element-hq/synapse/releases/tag/v1.105.1"},{"reference_url":"https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-04-23T19:13:09Z/"}],"url":"https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2024-50.yaml","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2024-50.yaml"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RR53FNHV446CB37TP45GZ6F6HZLZCK3K","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RR53FNHV446CB37TP45GZ6F6HZLZCK3K"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1069763","reference_id":"1069763","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1069763"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2024-31208","reference_id":"CVE-2024-31208","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-31208"},{"reference_url":"https://github.com/advisories/GHSA-3h7q-rfh9-xm4v","referenc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