{"id":"CVE-2026-9547","aliases":["ALPINE-CVE-2026-9547","ALSA-2026:55439","BELL-CVE-2026-9547","CURL-CVE-2026-9547","DEBIAN-CVE-2026-9547","EUVD-2026-41495","GHSA-xq9p-gxg6-f7q6","JLSEC-2026-1222","OESA-2026-2984","OESA-2026-2985","OESA-2026-2986","OESA-2026-2987","OESA-2026-2988","RHSA-2026:29017","RHSA-2026:34975","RHSA-2026:55439","RHSA-2026:55450","RHSA-2026:72506","RLSA-2026:55439","ROOT-OS-ALPINE-315-CVE-2026-9547","ROOT-OS-ALPINE-317-CVE-2026-9547","ROOT-OS-ALPINE-320-CVE-2026-9547","ROOT-OS-ALPINE-321-CVE-2026-9547","ROOT-OS-ALPINE-322-CVE-2026-9547","ROOT-OS-ALPINE-323-CVE-2026-9547","ROOT-OS-DEBIAN-11-CVE-2026-9547","ROOT-OS-DEBIAN-12-CVE-2026-9547","ROOT-OS-DEBIAN-13-CVE-2026-9547","SUSE-SU-2026:22553-1","SUSE-SU-2026:22582-1","SUSE-SU-2026:22709-1","SUSE-SU-2026:22889-1","SUSE-SU-2026:2925-1","SUSE-SU-2026:2926-1","SUSE-SU-2026:3043-1","SUSE-SU-2026:3814-1","UBUNTU-CVE-2026-9547","openSUSE-SU-2026:11230-1","openSUSE-SU-2026:21272-1"],"status":"published","title":"SSH improper host validation","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00361,"percentile":0.30163,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-297"],"published":"2026-06-24T08:00:00Z","modified":"2026-11-04T17:15:24Z","fixes":[{"ecosystem":"Alpine:v3.23","package":"curl","fixed_in":["8.22.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"curl","fixed_in":["8.21.0-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:23","package":"curl","fixed_in":["8.21.0-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:25","package":"curl","fixed_in":["8.21.0-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"curl","fixed_in":["8.21.0-r0"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened 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},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262926-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263043-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263814-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1263440","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-7168","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-9547","tags":["report"]},{"url":"https://curl.se/L7HzKXisfJ/CVE-2026-9547.md","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8487-1","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11352","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11564","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11586","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11856","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-8925","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-8926","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-8932","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-9546","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-9547","title":"SSH improper host validation","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-07-03T06:18:44.499Z","modified":"2026-09-15T06:03:34.802Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-297"],"updated_at":"2026-11-02T13:42:37.965383Z"}],"euvd":[{"id":"EUVD-2026-41495","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-07-03T06:18:44Z","modified":"2026-09-15T06:03:34Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T17:28:19.01786Z"}],"ghsa":[{"id":"GHSA-xq9p-gxg6-f7q6","title":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the ...","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-07-03T09:31:27Z","modified":"2026-09-15T09:31:34Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-297"],"updated_at":"2026-11-02T15:11:53.5286Z"}],"nvd":[{"id":"CVE-2026-9547","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-07-03T07:16:25.99Z","modified":"2026-09-15T07:16:35.31Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-297"],"updated_at":"2026-11-02T14:12:27.541515Z"}],"osv":[{"id":"ALPINE-CVE-2026-9547","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-07-03T07:16:25.99Z","modified":"2026-10-01T02:17:49.421964489Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"BELL-CVE-2026-9547","status":"published","published":"2026-06-26T06:12:35.791536Z","modified":"2026-07-08T07:15:11.525880501Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:27.468539Z"},{"id":"CVE-2026-9547","title":"SSH improper host validation","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-07-03T06:18:44.499Z","modified":"2026-10-28T11:09:55.654736535Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-297"],"updated_at":"2026-11-02T15:45:20.931171Z"},{"id":"DEBIAN-CVE-2026-9547","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the `known_hosts` file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-07-03T07:16:25.99Z","modified":"2026-10-01T03:03:56.302991345Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:46:07.324252Z"},{"id":"JLSEC-2026-1222","title":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the ...","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-08-07T20:11:58.984Z","modified":"2026-08-07T20:28:41.519142937Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:47:18.159338Z"},{"id":"OESA-2026-2984","title":"curl security update","description":"cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\n\nA vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.(CVE-2026-8286)\n\nA flaw in curl’s cookie parsing logic allows a malicious HTTP server to set\n\u0026apos;super cookies\u0026apos; that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains.(CVE-2026-8924)\n\nWhen reusing a libcurl handle for sequential transfers driven by\nenvironment-variable proxy configuration, libcurl fails to clear the proxy\nauthentication state between requests. Specifically, if the initial transfer\nauthenticates against `proxyA` using Digest auth, a subsequent transfer routed\nthrough `proxyB` erroneously leaks the `Proxy-Authorization:` header intended\nsolely for `proxyA`.(CVE-2026-8927)\n\nWhen a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.(CVE-2026-9547)","status":"published","published":"2026-07-19T11:11:53Z","modified":"2026-08-18T01:21:17.806928304Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"OESA-2026-2985","title":"curl security update","description":"cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\n\nA vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.(CVE-2026-8286)\n\nA flaw in curl’s cookie parsing logic allows a malicious HTTP server to set\n\u0026apos;super cookies\u0026apos; that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains.(CVE-2026-8924)\n\nWhen reusing a libcurl handle for sequential transfers driven by\nenvironment-variable proxy configuration, libcurl fails to clear the proxy\nauthentication state between requests. Specifically, if the initial transfer\nauthenticates against `proxyA` using Digest auth, a subsequent transfer routed\nthrough `proxyB` erroneously leaks the `Proxy-Authorization:` header intended\nsolely for `proxyA`.(CVE-2026-8927)\n\nWhen a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.(CVE-2026-9547)","status":"published","published":"2026-07-19T11:11:53Z","modified":"2026-08-18T01:21:17.820394879Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"OESA-2026-2986","title":"curl security update","description":"cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\n\nA use-after-free vulnerability exists in libcurl when an application\nconfigures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or\n`CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and\nfinally terminates the handle with `curl_easy_cleanup()`. During this final\ncleanup phase, libcurl attempts to access and modify an internal structure\nthat was already freed during the reset operation.(CVE-2026-10536)\n\nWhen a user invokes curl using a schemeless URL combined with\n`--proto-default` sftp (or scp), a disconnect occurs between the tool layer\nand libcurl. The tool layer incorrectly infers the URL scheme, which\nerroneously bypasses the initialization of critical SSH security options like\nCURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the\nlibcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes\nthe connection via SFTP/SCP as specified. Because the tool layer skipped the\nsecurity configuration, these SSH host verification options are silently\nomitted, causing curl to connect to an unverified SSH remote host without\nthrowing an error.(CVE-2026-12064)\n\nA vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.(CVE-2026-8286)\n\nA flaw in curl’s cookie parsing logic allows a malicious HTTP server to set\n\u0026apos;super cookies\u0026apos; that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains.(CVE-2026-8924)\n\nWhen reusing a libcurl handle for sequential transfers driven by\nenvironment-variable proxy configuration, libcurl fails to clear the proxy\nauthentication state between requests. Specifically, if the initial transfer\nauthenticates against `proxyA` using Digest auth, a subsequent transfer routed\nthrough `proxyB` erroneously leaks the `Proxy-Authorization:` header intended\nsolely for `proxyA`.(CVE-2026-8927)\n\nWhen a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.(CVE-2026-9547)","status":"published","published":"2026-07-19T11:11:53Z","modified":"2026-08-18T01:21:17.778116902Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"OESA-2026-2987","title":"curl security update","description":"cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\n\nA use-after-free vulnerability exists in libcurl when an application\nconfigures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or\n`CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and\nfinally terminates the handle with `curl_easy_cleanup()`. During this final\ncleanup phase, libcurl attempts to access and modify an internal structure\nthat was already freed during the reset operation.(CVE-2026-10536)\n\nWhen a user invokes curl using a schemeless URL combined with\n`--proto-default` sftp (or scp), a disconnect occurs between the tool layer\nand libcurl. The tool layer incorrectly infers the URL scheme, which\nerroneously bypasses the initialization of critical SSH security options like\nCURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the\nlibcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes\nthe connection via SFTP/SCP as specified. Because the tool layer skipped the\nsecurity configuration, these SSH host verification options are silently\nomitted, causing curl to connect to an unverified SSH remote host without\nthrowing an error.(CVE-2026-12064)\n\nA vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.(CVE-2026-8286)\n\nA flaw in curl’s cookie parsing logic allows a malicious HTTP server to set\n\u0026apos;super cookies\u0026apos; that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains.(CVE-2026-8924)\n\nWhen reusing a libcurl handle for sequential transfers driven by\nenvironment-variable proxy configuration, libcurl fails to clear the proxy\nauthentication state between requests. Specifically, if the initial transfer\nauthenticates against `proxyA` using Digest auth, a subsequent transfer routed\nthrough `proxyB` erroneously leaks the `Proxy-Authorization:` header intended\nsolely for `proxyA`.(CVE-2026-8927)\n\nWhen a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.(CVE-2026-9547)","status":"published","published":"2026-07-19T11:11:53Z","modified":"2026-08-18T01:21:18.083392891Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"OESA-2026-2988","title":"curl security update","description":"cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\n\nA use-after-free vulnerability exists in libcurl when an application\nconfigures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or\n`CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and\nfinally terminates the handle with `curl_easy_cleanup()`. During this final\ncleanup phase, libcurl attempts to access and modify an internal structure\nthat was already freed during the reset operation.(CVE-2026-10536)\n\nWhen a user invokes curl using a schemeless URL combined with\n`--proto-default` sftp (or scp), a disconnect occurs between the tool layer\nand libcurl. The tool layer incorrectly infers the URL scheme, which\nerroneously bypasses the initialization of critical SSH security options like\nCURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the\nlibcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes\nthe connection via SFTP/SCP as specified. Because the tool layer skipped the\nsecurity configuration, these SSH host verification options are silently\nomitted, causing curl to connect to an unverified SSH remote host without\nthrowing an error.(CVE-2026-12064)\n\nA vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.(CVE-2026-8286)\n\nA flaw in curl’s cookie parsing logic allows a malicious HTTP server to set\n\u0026apos;super cookies\u0026apos; that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains.(CVE-2026-8924)\n\nWhen reusing a libcurl handle for sequential transfers driven by\nenvironment-variable proxy configuration, libcurl fails to clear the proxy\nauthentication state between requests. Specifically, if the initial transfer\nauthenticates against `proxyA` using Digest auth, a subsequent transfer routed\nthrough `proxyB` erroneously leaks the `Proxy-Authorization:` header intended\nsolely for `proxyA`.(CVE-2026-8927)\n\nWhen a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.(CVE-2026-9547)","status":"published","published":"2026-07-19T11:11:53Z","modified":"2026-08-18T01:21:18.030205234Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"RHSA-2026:29017","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-07-16T10:07:43Z","modified":"2026-10-17T10:11:56Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:19.449341Z"},{"id":"RHSA-2026:34975","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-07-04T10:07:59Z","modified":"2026-10-17T10:12:31Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:19.963895Z"},{"id":"RHSA-2026:55439","title":"Red Hat Security Advisory: curl security update","status":"published","published":"2026-08-17T10:16:57Z","modified":"2026-10-16T10:20:08Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:21.457353Z"},{"id":"RHSA-2026:55450","title":"Red Hat Security Advisory: curl security update","status":"published","published":"2026-08-17T10:17:02Z","modified":"2026-10-16T10:20:09Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:21.457353Z"},{"id":"RHSA-2026:72506","title":"Red Hat Security Advisory: curl security update","status":"published","published":"2026-09-29T10:18:29Z","modified":"2026-10-16T10:24:58Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"RLSA-2026:55439","title":"Important: curl security update","description":"The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.\n\nSecurity Fix(es):\n\n* curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965)\n\n* curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783)\n\n* curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547)\n\n* curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-08-17T18:03:57.407277Z","modified":"2026-08-17T18:30:03.416244981Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:26.111232Z"},{"id":"UBUNTU-CVE-2026-9547","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the `known_hosts` file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-06-24T14:00:00Z","modified":"2026-07-08T09:45:46.438594894Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:57:44.071534Z"},{"id":"ALSA-2026:55439","title":"Important: curl security update","description":"The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.  \n\nSecurity Fix(es):  \n\n  * curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965)\n  * curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783)\n  * curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547)\n  * curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-08-17T00:00:00Z","modified":"2026-10-29T11:32:24.135471193Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"CURL-CVE-2026-9547","title":"SSH improper host validation","description":"When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.","status":"published","published":"2026-06-24T08:00:00Z","modified":"2026-10-25T01:05:45.81836285Z","updated_at":"2026-11-02T15:43:55.998148Z"},{"id":"openSUSE-SU-2026:11230-1","title":"curl-8.21.0-1.1 on GA media","description":"These are all security issues fixed in the curl-8.21.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-07-09T00:00:00Z","modified":"2026-07-10T10:00:10.392224841Z","updated_at":"2026-11-02T16:58:38.95195Z"},{"id":"openSUSE-SU-2026:21272-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-08T13:46:40Z","modified":"2026-07-11T18:24:39.683959322Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"ROOT-OS-ALPINE-315-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Alpine:3.15. Multiple fixed versions available.","status":"published","published":"2026-11-04T10:54:49Z","modified":"2026-11-04T11:15:03.036082861Z","updated_at":"2026-11-04T11:38:21.953745Z"},{"id":"ROOT-OS-ALPINE-317-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Alpine:3.17. Multiple fixed versions available.","status":"published","published":"2026-11-04T16:15:55Z","modified":"2026-11-04T17:15:24.361003835Z","updated_at":"2026-11-04T17:43:22.558805Z"},{"id":"ROOT-OS-ALPINE-320-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Alpine:3.20. Multiple fixed versions available.","status":"published","published":"2026-09-29T09:40:45Z","modified":"2026-09-29T10:15:12.04765298Z","updated_at":"2026-11-02T15:53:28.544053Z"},{"id":"ROOT-OS-ALPINE-321-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Alpine:3.21. Multiple fixed versions available.","status":"published","published":"2026-11-03T11:37:01Z","modified":"2026-11-03T12:15:04.357948608Z","updated_at":"2026-11-03T12:31:35.467775Z"},{"id":"ROOT-OS-ALPINE-322-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Alpine:3.22. Multiple fixed versions available.","status":"published","published":"2026-10-19T06:56:08Z","modified":"2026-10-19T07:15:05.958133707Z","updated_at":"2026-11-02T15:53:28.544053Z"},{"id":"ROOT-OS-ALPINE-323-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Alpine:3.23. Multiple fixed versions available.","status":"withdrawn","published":"2026-08-11T14:25:22Z","modified":"2026-10-09T13:00:06.535824861Z","updated_at":"2026-11-02T15:53:28.544053Z"},{"id":"ROOT-OS-DEBIAN-11-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Debian:11. Multiple fixed versions available.","status":"published","published":"2026-08-20T12:49:54Z","modified":"2026-08-20T13:30:11.275280415Z","updated_at":"2026-11-02T15:53:30.44348Z"},{"id":"ROOT-OS-DEBIAN-12-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Debian:12. Multiple fixed versions available.","status":"published","published":"2026-11-04T06:00:50Z","modified":"2026-11-04T07:15:10.230666971Z","updated_at":"2026-11-04T07:32:10.855619Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2026-9547","title":"CVE-2026-9547 in curl - Patched by Root","description":"Root has patched CVE-2026-9547 in the curl package for Root:Debian:13. Multiple fixed versions available.","status":"published","published":"2026-11-03T10:50:30Z","modified":"2026-11-03T11:15:04.665681766Z","updated_at":"2026-11-03T11:30:16.221977Z"},{"id":"SUSE-SU-2026:22553-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-08T13:46:31Z","modified":"2026-07-14T18:24:37.508643741Z","updated_at":"2026-11-02T15:54:03.080707Z"},{"id":"SUSE-SU-2026:22582-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-08T13:46:31Z","modified":"2026-07-15T18:24:12.557773119Z","updated_at":"2026-11-02T15:54:03.080707Z"},{"id":"SUSE-SU-2026:22709-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-14T12:55:28Z","modified":"2026-07-23T18:24:15.490752267Z","updated_at":"2026-11-02T15:54:03.080707Z"},{"id":"SUSE-SU-2026:22889-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-21T16:53:33Z","modified":"2026-07-28T18:24:18.578169362Z","updated_at":"2026-11-02T15:54:03.080707Z"},{"id":"SUSE-SU-2026:2925-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-13T17:53:28Z","modified":"2026-07-15T10:00:04.814454459Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:2926-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-13T17:55:13Z","modified":"2026-07-15T10:00:04.824336179Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:3043-1","title":"Security update for curl","description":"This update for curl fixes the following issues\n\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-8927: env-set cross-proxy Digest auth state leak (bsc#1268413).\n- CVE-2026-9079: stale proxy password leak (bsc#1268415).\n- CVE-2026-9080: UAF after pause in socket callback (bsc#1268416).\n- CVE-2026-9545: exposing HTTP/3 early data (bsc#1268417).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n- CVE-2026-12064: proto-default skips SSH verification (bsc#1268427).\n","status":"published","published":"2026-07-15T11:51:36Z","modified":"2026-07-16T10:00:08.029752736Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:3814-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).\n- CVE-2026-8286: wrong STARTTLS connection reuse (bsc#1268402).\n- CVE-2026-8458: wrong reuse for different services (bsc#1268407).\n- CVE-2026-8924: traling dot domain super cookie (bsc#1268409).\n- CVE-2026-9547: SSH improper host validation (bsc#1268420).\n- CVE-2026-10536: HTTP/2 stream-dependency tree UAF (bsc#1268422).\n","status":"published","published":"2026-08-26T10:56:35Z","modified":"2026-08-31T18:23:11.041034898Z","updated_at":"2026-11-02T15:54:05.392906Z"}]}}