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This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27536.json","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27536.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-27536","reference_id":"","reference_type":"","scores":[{"value":"0.00011","scoring_system":"epss","scoring_elements":"0.01404","published_at":"2026-06-05T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-27536"},{"reference_url":"https://curl.se/docs/CVE-2023-27536.html","reference_id":"","reference_type":"","scores":[{"value":"Low","scoring_system":"cvssv3.1","scoring_elements":""}],"url":"https://curl.se/docs/CVE-2023-27536.html"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27536","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27536"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://hackerone.com/reports/1895135","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/"}],"url":"https://hackerone.com/reports/1895135"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2179092","reference_id":"2179092","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2179092"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/","reference_id":"36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/"}],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27536","reference_id":"CVE-2023-27536","reference_type":"","scores":[],"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27536"},{"reference_url":"https://security.gentoo.org/glsa/202310-12","reference_id":"GLSA-202310-12","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/"}],"url":"https://security.gentoo.org/glsa/202310-12"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html","reference_id":"msg00025.html","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/"}],"url":"https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html"},{"reference_url":"https://security.netapp.com/advisory/ntap-20230420-0010/","reference_id":"ntap-20230420-0010","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/"}],"url":"https://security.netapp.com/advisory/ntap-20230420-0010/"},{"reference_url":"https://access.redhat.com/errata/RHSA-2023:4523","reference_id":"RHSA-2023:4523","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2023:4523"},{"reference_url":"https://access.redhat.com/errata/RHSA-2023:6679","reference_id":"RHSA-2023:6679","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2023:6679"},{"reference_url":"https://access.redhat.com/errata/RHSA-2024:0428","reference_id":"RHSA-2024:0428","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2024:0428"},{"reference_url":"https://usn.ub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Authentication\nAn authentication bypass vulnerability exists in libcurl v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27538.json","reference_id":"","reference_type":"","scores":[{"value":"5.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27538.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-27538","reference_id":"","reference_type":"","scores":[{"value":"0.00012","scoring_system":"epss","scoring_elements":"0.01683","published_at":"2026-06-05T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-27538"},{"reference_url":"https://curl.se/docs/CVE-2023-27538.html","reference_id":"","reference_type":"","scores":[{"value":"Low","scoring_system":"cvssv3.1","scoring_elements":""}],"url":"https://curl.se/docs/CVE-2023-27538.html"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27538","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27538"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://hackerone.com/reports/1898475","reference_id":"","reference_type":"","scores":[{"value":"7.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/"}],"url":"https://hackerone.com/reports/1898475"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2179103","reference_id":"2179103","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2179103"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27538","reference_id":"CVE-2023-27538","reference_type":"","scores":[],"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27538"},{"reference_url":"https://security.gentoo.org/glsa/202310-12","reference_id":"GLSA-202310-12","reference_type":"","scores":[{"value":"7.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/"}],"url":"https://security.gentoo.org/glsa/202310-12"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html","reference_id":"msg00025.html","reference_type":"","scores":[{"value":"7.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/"}],"url":"https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html"},{"reference_url":"https://security.netapp.com/advisory/ntap-20230420-0010/","reference_id":"ntap-20230420-0010","reference_type":"","scores":[{"value":"7.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/"}],"url":"https://security.netapp.com/advisory/ntap-20230420-0010/"},{"reference_url":"https://access.redhat.com/errata/RHSA-2023:6679","reference_id":"RHSA-2023:6679","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2023:6679"},{"reference_url":"https://usn.ubuntu.com/5964-1/","reference_id":"USN-5964-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/5964-1/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/419269?format=json","purl":"pkg:apk/alpine/curl@8.0.0-r0?arch=armv7&distroversion=v3.19&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/curl@8.0.0-r0%3Farch=armv7&distroversion=v3.19&reponame=main"}],"aliases":["CVE-2023-27538"],"risk_score":2.5,"exploitability":"0.5","weighted_severity":"5.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-gueb-wzpx-ufb2"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/curl@8.0.0-r0%3Farch=armv7&distroversion=v3.19&reponame=main"}