{"id":"CVE-2026-6429","aliases":["ALPINE-CVE-2026-6429","ALSA-2026:80512","AZL-86661","AZL-86688","BELL-CVE-2026-6429","CLSA-2026-1785564870","CLSA-2026-1785847606","CURL-CVE-2026-6429","DEBIAN-CVE-2026-6429","EUVD-2026-29930","GHSA-2pvc-5qw9-h3ph","JLSEC-2026-1208","OESA-2026-2451","OESA-2026-2452","OESA-2026-2453","OESA-2026-2454","OESA-2026-2477","RHSA-2026:12916","RHSA-2026:80512","RLSA-2026:80512","ROOT-OS-DEBIAN-11-CVE-2026-6429","ROOT-OS-DEBIAN-12-CVE-2026-6429","ROOT-OS-DEBIAN-13-CVE-2026-6429","SUSE-SU-2026:1717-1","SUSE-SU-2026:1940-1","SUSE-SU-2026:21452-1","SUSE-SU-2026:22146-1","SUSE-SU-2026:22156-1","SUSE-SU-2026:2703-1","SUSE-SU-2026:3798-1","UBUNTU-CVE-2026-6429","openSUSE-SU-2026:10674-1","openSUSE-SU-2026:20973-1"],"status":"published","title":"netrc credential leak with reused proxy connection","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00519,"percentile":0.44395,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2026-04-29T08:00:00Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Alpine:v3.21","package":"curl","fixed_in":["8.14.1-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"curl","fixed_in":["8.14.1-r4"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"curl","fixed_in":["8.20.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"curl","fixed_in":["8.20.0-r0"],"sources":["osv"]},{"ecosystem":"Azure Linux:3","package":"curl","fixed_in":["8.11.1-9"],"sources":["osv"]},{"ecosystem":"Azure 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urity.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_80512.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-7168","tags":["advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/04/29/14","tags":["article"]},{"url":"https://curl.se/docs/CVE-2026-7168.html","tags":["article"]},{"url":"https://curl.se/docs/CVE-2026-7168.json","tags":["article"]},{"url":"https://hackerone.com/reports/3697719","tags":["article"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-10536","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-10536","tags":["advisory"]},{"url":"https://curl.se/docs/CVE-2026-10536.html","tags":["article"]},{"url":"https://curl.se/docs/CVE-2026-10536.json","tags":["article"]},{"url":"https://hackerone.com/reports/3751697","tags":["article"]},{"url":"https://errata.rockylinux.org/RLSA-2026:80512","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261717-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1259362","tags":["report"]},{"url":"https://bugzilla.suse.com/1262631","tags":["report"]},{"url":"https://bugzilla.suse.com/1262632","tags":["report"]},{"url":"https://bugzilla.suse.com/1262635","tags":["report"]},{"url":"https://bugzilla.suse.com/1262636","tags":["report"]},{"url":"https://bugzilla.suse.com/1262638","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-1965","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-4873","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-5545","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6253","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6276","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6429","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261940-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202621452-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202622146-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202622156-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262703-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1262633","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-5773","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263798-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1263440","tags":["report"]},{"url":"https://bugzilla.suse.com/1268412","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-7168","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-8926","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-6429","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8227-1","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-6429","title":"netrc credential leak with reused proxy connection","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-13T08:28:36.166Z","modified":"2026-09-15T06:03:05.855Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T13:49:53.818886Z"}],"euvd":[{"id":"EUVD-2026-29930","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-13T08:28:36Z","modified":"2026-09-15T06:03:05Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T17:28:19.01786Z"}],"ghsa":[{"id":"GHSA-2pvc-5qw9-h3ph","title":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl...","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-14T15:31:56Z","modified":"2026-09-15T09:31:30Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:11:53.5286Z"}],"nvd":[{"id":"CVE-2026-6429","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-13T13:01:56.93Z","modified":"2026-09-15T07:16:29.557Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:12:19.020465Z"}],"osv":[{"id":"ALPINE-CVE-2026-6429","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-13T13:01:56.93Z","modified":"2026-10-18T12:30:04.035818245Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:27:50.764331Z"},{"id":"BELL-CVE-2026-6429","status":"published","published":"2026-05-01T06:09:38.9177Z","modified":"2026-05-15T07:19:56.81284Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:28:25.231222Z"},{"id":"CVE-2026-6429","title":"netrc credential leak with reused proxy connection","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-13T08:28:36.166Z","modified":"2026-10-28T11:17:08.96429796Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:45:13.752441Z"},{"id":"DEBIAN-CVE-2026-6429","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.","status":"published","published":"2026-05-13T13:01:56.93Z","modified":"2026-10-01T03:02:42.937148813Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:58.307012Z"},{"id":"JLSEC-2026-1208","title":"When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl...","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-08-07T20:11:58.984Z","modified":"2026-08-07T20:28:40.418819188Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:47:18.159338Z"},{"id":"OESA-2026-2451","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 connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.(CVE-2026-4873)\n\nlibcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0026apos;s and user2\u0026apos;s credentials when it is in fact\nstill using the connection authenticated for user1...(CVE-2026-5545)\n\nlibcurl might in some circumstances reuse the wrong connection for SMB(S)\ntransfers.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a network transfer operation that was requested by an\napplication could wrongfully reuse an existing SMB connection to the same\nserver that was using a different \u0026apos;share\u0026apos; than the new subsequent transfer\nshould.\n\nThis could in unlucky situations lead to the download of the wrong file or the\nupload of a file to the wrong place. When this happens, the same credentials\nare used and the server name is the same.(CVE-2026-5773)\n\ncurl might erroneously pass on credentials for a first proxy to a second\nproxy.\n\nThis can happen when the following conditions are true:\n\n1. curl is setup to use specific different proxies for different URL schemes\n2. the first proxy needs credentials\n3. the second proxy uses no credentials\n4. while using the first proxy (using say `http://`), curl is asked to follow\n   a redirect to a URL using another scheme (say `https://`), accessed using a\n   second, different, proxy(CVE-2026-6253)\n\nUsing libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.(CVE-2026-6276)\n\nWhen asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.(CVE-2026-6429)\n\nSuccessfully using libcurl to do a transfer over a specific HTTP proxy\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\n`proxyA`, to `proxyB`.(CVE-2026-7168)","status":"published","published":"2026-05-22T11:11:24Z","modified":"2026-08-18T01:19:59.385572992Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"OESA-2026-2452","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 connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.(CVE-2026-4873)\n\nlibcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0026apos;s and user2\u0026apos;s credentials when it is in fact\nstill using the connection authenticated for user1...(CVE-2026-5545)\n\nlibcurl might in some circumstances reuse the wrong connection for SMB(S)\ntransfers.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a network transfer operation that was requested by an\napplication could wrongfully reuse an existing SMB connection to the same\nserver that was using a different \u0026apos;share\u0026apos; than the new subsequent transfer\nshould.\n\nThis could in unlucky situations lead to the download of the wrong file or the\nupload of a file to the wrong place. When this happens, the same credentials\nare used and the server name is the same.(CVE-2026-5773)\n\ncurl might erroneously pass on credentials for a first proxy to a second\nproxy.\n\nThis can happen when the following conditions are true:\n\n1. curl is setup to use specific different proxies for different URL schemes\n2. the first proxy needs credentials\n3. the second proxy uses no credentials\n4. while using the first proxy (using say `http://`), curl is asked to follow\n   a redirect to a URL using another scheme (say `https://`), accessed using a\n   second, different, proxy(CVE-2026-6253)\n\nUsing libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.(CVE-2026-6276)\n\nWhen asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.(CVE-2026-6429)\n\nSuccessfully using libcurl to do a transfer over a specific HTTP proxy\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\n`proxyA`, to `proxyB`.(CVE-2026-7168)","status":"published","published":"2026-05-22T11:11:24Z","modified":"2026-08-18T01:20:00.173223473Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"OESA-2026-2453","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 connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.(CVE-2026-4873)\n\nlibcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0026apos;s and user2\u0026apos;s credentials when it is in fact\nstill using the connection authenticated for user1...(CVE-2026-5545)\n\nlibcurl might in some circumstances reuse the wrong connection for SMB(S)\ntransfers.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a network transfer operation that was requested by an\napplication could wrongfully reuse an existing SMB connection to the same\nserver that was using a different \u0026apos;share\u0026apos; than the new subsequent transfer\nshould.\n\nThis could in unlucky situations lead to the download of the wrong file or the\nupload of a file to the wrong place. When this happens, the same credentials\nare used and the server name is the same.(CVE-2026-5773)\n\ncurl might erroneously pass on credentials for a first proxy to a second\nproxy.\n\nThis can happen when the following conditions are true:\n\n1. curl is setup to use specific different proxies for different URL schemes\n2. the first proxy needs credentials\n3. the second proxy uses no credentials\n4. while using the first proxy (using say `http://`), curl is asked to follow\n   a redirect to a URL using another scheme (say `https://`), accessed using a\n   second, different, proxy(CVE-2026-6253)\n\nUsing libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.(CVE-2026-6276)\n\nWhen asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.(CVE-2026-6429)\n\nSuccessfully using libcurl to do a transfer over a specific HTTP proxy\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\n`proxyA`, to `proxyB`.(CVE-2026-7168)","status":"published","published":"2026-05-22T11:11:24Z","modified":"2026-08-18T01:20:00.167468481Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"OESA-2026-2454","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 connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.(CVE-2026-4873)\n\nlibcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0026apos;s and user2\u0026apos;s credentials when it is in fact\nstill using the connection authenticated for user1...(CVE-2026-5545)\n\nlibcurl might in some circumstances reuse the wrong connection for SMB(S)\ntransfers.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a network transfer operation that was requested by an\napplication could wrongfully reuse an existing SMB connection to the same\nserver that was using a different \u0026apos;share\u0026apos; than the new subsequent transfer\nshould.\n\nThis could in unlucky situations lead to the download of the wrong file or the\nupload of a file to the wrong place. When this happens, the same credentials\nare used and the server name is the same.(CVE-2026-5773)\n\ncurl might erroneously pass on credentials for a first proxy to a second\nproxy.\n\nThis can happen when the following conditions are true:\n\n1. curl is setup to use specific different proxies for different URL schemes\n2. the first proxy needs credentials\n3. the second proxy uses no credentials\n4. while using the first proxy (using say `http://`), curl is asked to follow\n   a redirect to a URL using another scheme (say `https://`), accessed using a\n   second, different, proxy(CVE-2026-6253)\n\nUsing libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.(CVE-2026-6276)\n\nWhen asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.(CVE-2026-6429)\n\nSuccessfully using libcurl to do a transfer over a specific HTTP proxy\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\n`proxyA`, to `proxyB`.(CVE-2026-7168)","status":"published","published":"2026-05-22T11:11:24Z","modified":"2026-08-18T01:20:00.207520282Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"OESA-2026-2477","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 connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.(CVE-2026-4873)\n\nlibcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0026apos;s and user2\u0026apos;s credentials when it is in fact\nstill using the connection authenticated for user1...(CVE-2026-5545)\n\nlibcurl might in some circumstances reuse the wrong connection for SMB(S)\ntransfers.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a network transfer operation that was requested by an\napplication could wrongfully reuse an existing SMB connection to the same\nserver that was using a different \u0026apos;share\u0026apos; than the new subsequent transfer\nshould.\n\nThis could in unlucky situations lead to the download of the wrong file or the\nupload of a file to the wrong place. When this happens, the same credentials\nare used and the server name is the same.(CVE-2026-5773)\n\ncurl might erroneously pass on credentials for a first proxy to a second\nproxy.\n\nThis can happen when the following conditions are true:\n\n1. curl is setup to use specific different proxies for different URL schemes\n2. the first proxy needs credentials\n3. the second proxy uses no credentials\n4. while using the first proxy (using say `http://`), curl is asked to follow\n   a redirect to a URL using another scheme (say `https://`), accessed using a\n   second, different, proxy(CVE-2026-6253)\n\nUsing libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.(CVE-2026-6276)\n\nWhen asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.(CVE-2026-6429)\n\nSuccessfully using libcurl to do a transfer over a specific HTTP proxy\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\n`proxyA`, to `proxyB`.(CVE-2026-7168)","status":"published","published":"2026-05-29T11:11:26Z","modified":"2026-08-18T01:20:00.949425098Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"RHSA-2026:12916","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-05-03T10:03:35Z","modified":"2026-10-15T10:12:44Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:18.066978Z"},{"id":"RHSA-2026:80512","title":"Red Hat Security Advisory: curl security update","status":"published","published":"2026-10-14T10:31:49Z","modified":"2026-10-15T10:28:00Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:23.547034Z"},{"id":"RLSA-2026:80512","title":"Moderate: 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: Proxy credential disclosure via redirects to unauthenticated proxies (CVE-2026-6253)\n\n* curl: libcurl: Authentication bypass due to incorrect HTTP Negotiate connection reuse (CVE-2026-5545)\n\n* curl: libcurl: Credential leak via reused proxy connection during HTTP redirects (CVE-2026-6429)\n\n* curl: libcurl: Information disclosure via incorrect Proxy-Authorization header reuse (CVE-2026-7168)\n\n* libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service (CVE-2026-10536)\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":"2026-10-15T00:08:46.966634Z","modified":"2026-10-15T00:30:02.672952336Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"ROOT-OS-DEBIAN-11-CVE-2026-6429","title":"CVE-2026-6429 in curl - Patched by Root","description":"Root has patched CVE-2026-6429 in the curl package for Root:Debian:11. Multiple fixed versions available.","status":"published","published":"2026-08-20T12:49:54Z","modified":"2026-08-20T13:30:03.65444561Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:30.44348Z"},{"id":"ROOT-OS-DEBIAN-12-CVE-2026-6429","title":"CVE-2026-6429 in curl - Patched by Root","description":"Root has patched CVE-2026-6429 in the curl package for Root:Debian:12. Multiple fixed versions available.","status":"published","published":"2026-11-04T06:00:50Z","modified":"2026-11-04T07:15:08.052523631Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-04T07:32:10.855619Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2026-6429","title":"CVE-2026-6429 in rootio-curl - Patched by Root","description":"Root has patched CVE-2026-6429 in the rootio-curl package for Root:Debian:13. Multiple fixed versions available.","status":"withdrawn","published":"2026-07-10T15:43:44Z","modified":"2026-07-13T14:00:22.554008772Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:33.681527Z"},{"id":"UBUNTU-CVE-2026-6429","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.","status":"published","published":"2026-04-29T14:00:00Z","modified":"2026-10-17T12:56:24.130965676Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:48.57134Z"},{"id":"ALSA-2026:80512","title":"Moderate: 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: Proxy credential disclosure via redirects to unauthenticated proxies (CVE-2026-6253)\n  * curl: libcurl: Authentication bypass due to incorrect HTTP Negotiate connection reuse (CVE-2026-5545)\n  * curl: libcurl: Credential leak via reused proxy connection during HTTP redirects (CVE-2026-6429)\n  * curl: libcurl: Information disclosure via incorrect Proxy-Authorization header reuse (CVE-2026-7168)\n  * libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service (CVE-2026-10536)\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":"2026-10-12T00:00:00Z","modified":"2026-10-29T11:30:08.644938407Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"id":"AZL-86661","title":"CVE-2026-6429 affecting package curl for versions less than 8.11.1-9","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-13T13:01:56Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:25.190302Z"},{"id":"AZL-86688","title":"CVE-2026-6429 affecting package cmake for versions less than 3.30.3-14","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-05-13T13:01:56Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:25.190302Z"},{"id":"CLSA-2026-1785564870","title":"curl: Fix of 4 CVEs","description":"- CVE-2026-4873: do not reuse a clear-text STARTTLS connection when the new\n  transfer requires TLS, so an IMAP, SMTP or POP3 request that mandates TLS is\n  not sent over an unencrypted connection\n- CVE-2026-6253: restore the proxy credentials set via options on every\n  redirect so credentials belonging to the first proxy are not disclosed to a\n  second, different proxy\n- CVE-2026-6429: drop credentials that were not set through CURLOPT_USERNAME\n  on redirect so a netrc password established for the first host is not sent to\n  the redirect target over a reused connection or proxy\n- CVE-2026-8924: trim trailing dots from the request and cookie domains before\n  the public suffix list check so a trailing-dot domain cannot set a super\n  cookie scoped to an unrelated site","status":"published","published":"2026-08-01T06:14:43Z","modified":"2026-10-26T09:31:23.851079825Z","updated_at":"2026-11-02T15:43:46.850893Z"},{"id":"CLSA-2026-1785847606","title":"curl: Fix of 4 CVEs","description":"- CVE-2026-4873: do not reuse a clear-text STARTTLS connection when the new\n  transfer requires TLS, so an IMAP, SMTP or POP3 request that mandates TLS is\n  not sent over an unencrypted connection\n- CVE-2026-6253: restore the proxy credentials set via options on every\n  redirect so credentials belonging to the first proxy are not disclosed to a\n  second, different proxy\n- CVE-2026-6429: drop credentials that were not set through CURLOPT_USERNAME\n  on redirect so a netrc password established for the first host is not sent to\n  the redirect target over a reused connection or proxy\n- CVE-2026-8924: trim trailing dots from the request and cookie domains before\n  the public suffix list check so a trailing-dot domain cannot set a super\n  cookie scoped to an unrelated site","status":"published","published":"2026-08-04T12:47:00Z","modified":"2026-10-26T09:30:31.727226847Z","updated_at":"2026-11-02T15:43:46.850893Z"},{"id":"CURL-CVE-2026-6429","title":"netrc credential leak with reused proxy connection","description":"When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.","status":"published","published":"2026-04-29T08:00:00Z","modified":"2026-10-25T01:16:47.567308974Z","updated_at":"2026-11-02T15:43:55.998148Z"},{"id":"openSUSE-SU-2026:10674-1","title":"curl-8.20.0-1.1 on GA media","description":"These are all security issues fixed in the curl-8.20.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-04T00:00:00Z","modified":"2026-05-05T07:46:40.778646Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"openSUSE-SU-2026:20973-1","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-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n","status":"published","published":"2026-06-17T08:47:34Z","modified":"2026-06-24T18:24:21.071415239Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"SUSE-SU-2026:1717-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).\n- CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n\nOther updates and bugfixes:\n\n- sws: prevent 'connection monitor' to say disconnect twice (bsc#1259362).\n","status":"published","published":"2026-05-06T12:13:54Z","modified":"2026-05-07T08:46:21.899858Z","updated_at":"2026-11-02T15:54:01.610851Z"},{"id":"SUSE-SU-2026:1940-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).\n- CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n\nOther updates and bugfixes:\n\n- sws: prevent 'connection monitor' to say disconnect twice (bsc#1259362).\n","status":"published","published":"2026-05-18T07:44:20Z","modified":"2026-05-19T08:45:08.261772469Z","updated_at":"2026-11-02T15:54:01.610851Z"},{"id":"SUSE-SU-2026:21452-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).\n- CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n\nOther updates and bugfixes:\n\n- sws: prevent \"connection monitor\" to say disconnect twice (bsc#1259362).\n","status":"published","published":"2026-04-30T14:46:10Z","modified":"2026-05-05T18:23:55.855178Z","updated_at":"2026-11-02T15:54:02.312556Z"},{"id":"SUSE-SU-2026:22146-1","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-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n","status":"published","published":"2026-06-17T08:57:16Z","modified":"2026-06-19T18:24:06.180348168Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:22156-1","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-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n","status":"published","published":"2026-06-17T08:57:16Z","modified":"2026-06-24T18:24:22.566714968Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:2703-1","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-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n","status":"published","published":"2026-06-30T10:27:48Z","modified":"2026-07-01T09:45:07.290337429Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:3798-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).\n- CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).\n- CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).\n- CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).\n- CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).\n- CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).\n- CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).\n","status":"published","published":"2026-08-25T12:41:04Z","modified":"2026-08-27T11:01:49.76472582Z","updated_at":"2026-11-02T15:54:05.392906Z"}]}}