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When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the `certificate_check` field of libgit2's `git_remote_callbacks` structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-22742.json","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-22742.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-22742","reference_id":"","reference_type":"","scores":[{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31147","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.30494","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31194","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31014","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31069","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31099","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31106","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31062","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31017","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.31049","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.3103","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.30998","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.3084","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.30722","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00121","scoring_system":"epss","scoring_elements":"0.30639","published_at":"2026-04-29T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-22742"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-22742","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-22742"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-10T20:59:36Z/"}],"url":"https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56"},{"reference_url":"https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58ea","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-10T20:59:36Z/"}],"url":"https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58ea"},{"reference_url":"https://github.com/libgit2/libgit2/releases/tag/v1.4.5","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-10T20:59:36Z/"}],"url":"https://github.com/libgit2/libgit2/releases/tag/v1.4.5"},{"reference_url":"https://github.com/libgit2/libgit2/releases/tag/v1.5.1","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-10T20:59:36Z/"}],"url":"https://github.com/libgit2/libgit2/releases/tag/v1.5.1"},{"reference_url":"https://www.libssh2.org","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-03-10T20:59:36Z/"}],"url":"https://www.libssh2.org"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1029368","reference_id":"1029368","reference_type":"","scores":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NTFS protections inactive when running Git in the Windows Subsystem for Linux","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12279.json","reference_id":"","reference_type":"","scores":[{"value":"8.1","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12279.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-12279","reference_id":"","reference_type":"","scores":[{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89855","published_at":"2026-04-01T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89858","published_at":"2026-04-02T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89871","published_at":"2026-04-04T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89877","published_at":"2026-04-07T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89893","published_at":"2026-04-08T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89898","published_at":"2026-04-09T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89905","published_at":"2026-04-21T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89903","published_at":"2026-04-12T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89896","published_at":"2026-04-13T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.8991","published_at":"2026-04-16T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89911","published_at":"2026-04-18T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.8992","published_at":"2026-04-26T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89919","published_at":"2026-04-29T12:55:00Z"},{"value":"0.05164","scoring_system":"epss","scoring_elements":"0.89934","published_at":"2026-05-05T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-12279"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12279","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12279"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1829407","reference_id":"1829407","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1829407"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12279","reference_id":"CVE-2020-12279","reference_type":"","scores":[],"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12279"},{"reference_url":"https://usn.ubuntu.com/6678-1/","reference_id":"USN-6678-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/6678-1/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/352483?format=json","purl":"pkg:gem/rugged@0.28.4","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-t2ph-v249-a7g9"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:gem/rugged@0.28.4"}],"aliases":["CVE-2020-12279","GHSA-589j-mmg9-733v"],"risk_score":3.6,"exploitability":"0.5","weighted_severity":"7.3","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-tmtv-wcxy-sqht"}],"fixing_vulnerabilities":[],"risk_score":"3.6","resource_url":"http://public2.vulnerablecode.io/packages/pkg:gem/rugged@0.27.10.1"}