{"id":"CVE-2026-63379","aliases":["ALSA-2026:67909","ALSA-2026:67910","AZL-96903","AZL-96941","AZL-97533","AZL-97557","BELL-CVE-2026-63379","CLSA-2026-1790587734","DEBIAN-CVE-2026-63379","EUVD-2026-63562","GHSA-2gmv-p5m7-98p6","MGASA-2026-0294","OESA-2026-3268","RHSA-2026:60853","RHSA-2026:67909","RHSA-2026:67910","RLSA-2026:67909","RLSA-2026:67910","UBUNTU-CVE-2026-63379","openSUSE-SU-2026:12330-1"],"status":"published","title":"Libevent: HTTP Header smuggling","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","severity":{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00518,"percentile":0.44534,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2026-07-24T16:09:36Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Azure Linux:3","package":"libevent","fixed_in":["2.1.13-1"],"sources":["osv"]},{"ecosystem":"Azure Linux:3","package":"mysql","fixed_in":["8.0.46-2"],"sources":["osv"]},{"ecosystem":"Azure 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url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63383","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63384","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63385","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63387","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63388","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63379.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-63379","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0294.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35801","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2026/07/01/8","tags":["web"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3268","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:60853","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_60853.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520667","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63379","tags":["advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520657","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63381","tags":["advisory"]},{"url":"https://github.com/libevent/libevent/commit/5cb95ba2f804f8aff46f88d58391c71e1251cd1c","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/9db091b04f569be3a700fa9860ef02f90b830af9","tags":["article"]},{"url":"https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-cg4r-88c8","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520654","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63383","tags":["advisory"]},{"url":"https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc75180cb","tags":["article"]},{"url":"https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520658","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63384","tags":["advisory"]},{"url":"https://github.com/libevent/libevent/commit/109c16499282959d70f56ec3baf4c8b1e6646bda","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/5e3c6ebe342b34c5a9bcf48e9a32ad6708b9c416","tags":["article"]},{"url":"https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520661","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63388","tags":["advisory"]},{"url":"https://github.com/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/ef38f926e9cd1f082416c6fff13587bc1f431d72","tags":["article"]},{"url":"https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338","tags":["article"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520655","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520660","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520666","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_67909.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63382","tags":["advisory"]},{"url":"https://github.com/libevent/libevent/commit/10abb34b8dc3e1184de315dd261ce4b77563cda6","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/5119ceb00557bf007f9065709e852686f3c0bb6e","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/83ba67373032334559b82409db035dd8c3cc1660","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/ac38703b2d312200c4f967f02936af0118d384a0","tags":["article"]},{"url":"https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j","tags":["article"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63385","tags":["advisory"]},{"url":"https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0","tags":["article"]},{"url":"https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2","tags":["article"]},{"url":"https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-pvf2-73p2","tags":["article"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63387","tags":["advisory"]},{"url":"https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_67910.json","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:67909","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:67910","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-63379","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63379","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63381","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63382","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63383","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63384","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63385","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63387","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63388","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-63379","title":"Libevent: HTTP Header smuggling","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T17:55:00.789Z","modified":"2026-08-25T15:14:26.228Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:19:55.914391Z"}],"euvd":[{"id":"EUVD-2026-63562","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T17:55:00Z","modified":"2026-08-25T15:14:26Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:01:32.513581Z"}],"nvd":[{"id":"CVE-2026-63379","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35.2Z","modified":"2026-10-26T10:10:00.14Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:12:40.302911Z"}],"osv":[{"id":"CVE-2026-63379","title":"Libevent: HTTP Header smuggling","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T17:55:00.789Z","modified":"2026-10-29T12:27:01.264546405Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:45:13.306117Z"},{"id":"DEBIAN-CVE-2026-63379","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35.2Z","modified":"2026-10-27T09:47:41.618963278Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-02T15:45:57.932517Z"},{"id":"OESA-2026-3268","title":"libevent security update","description":"Libevent additionally provides a sophisticated framework for buffered network IO, with support for sockets, filters, rate-limiting, SSL, zero-copy file transmission, and IOCP. Libevent includes support for several useful protocols, including DNS, HTTP, and a minimal RPC framewor.\r\n\r\nSecurity Fix(es):\n\nThe updated packages fix some security vulnerabilities. libevent is a lightweight event notification library used for handling event loops and callback mechanisms, widely used in network applications.(CVE-2026-63379)\n\nThe updated packages fix some security vulnerabilities affecting the libevent library.(CVE-2026-63381)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63382)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63383)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63384)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63385)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63387)\n\nThe updated packages fix some security vulnerabilities.(CVE-2026-63388)","status":"published","published":"2026-08-07T02:42:54Z","modified":"2026-08-07T03:00:59.366562112Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"RHSA-2026:60853","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-30T10:06:48Z","modified":"2026-10-06T10:31:29.343769134Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"RHSA-2026:67909","title":"Red Hat Security Advisory: libevent security update","status":"published","published":"2026-09-17T10:18:08Z","modified":"2026-10-20T10:14:05Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:22.406388Z"},{"id":"RHSA-2026:67910","title":"Red Hat Security Advisory: libevent security update","status":"published","published":"2026-09-17T10:18:09Z","modified":"2026-10-20T10:14:06Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:22.406388Z"},{"id":"RLSA-2026:67909","title":"Important: libevent security update","description":"The libevent packages provide an abstract asynchronous event notification library.\n\nSecurity Fix(es):\n\n* libevent: Libevent: Denial of Service via malformed RPC data (CVE-2026-63383)\n\n* libevent: Libevent: Off-by-one stack buffer overflow leading to denial of service or data corruption (CVE-2026-63387)\n\n* libevent: Libevent: Memory corruption due to use-after-free (CVE-2026-63381)\n\n* libevent: Libevent: Denial of Service via integer conversion error in `evtag_unmarshal_header` (CVE-2026-63384)\n\n* libevent evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling (CVE-2026-63382)\n\n* libevent: Libevent: Arbitrary code execution via heap out-of-bounds write in AF_UNIX handling (CVE-2026-63388)\n\n* libevent: Libevent: HTTP header handling bugs create risk of access control bypass. (CVE-2026-63385)\n\n* libevent: Libevent: HTTP header smuggling allows authorization bypass or cache poisoning (CVE-2026-63379)\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":"2026-09-17T12:09:45.694481Z","modified":"2026-09-17T12:30:02.601512822Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"RLSA-2026:67910","title":"Important: libevent security update","description":"The libevent packages provide an abstract asynchronous event notification library.\n\nSecurity Fix(es):\n\n* libevent: Libevent: Denial of Service via malformed RPC data (CVE-2026-63383)\n\n* libevent: Libevent: Off-by-one stack buffer overflow leading to denial of service or data corruption (CVE-2026-63387)\n\n* libevent: Libevent: Memory corruption due to use-after-free (CVE-2026-63381)\n\n* libevent: Libevent: Denial of Service via integer conversion error in `evtag_unmarshal_header` (CVE-2026-63384)\n\n* libevent evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling (CVE-2026-63382)\n\n* libevent: Libevent: Arbitrary code execution via heap out-of-bounds write in AF_UNIX handling (CVE-2026-63388)\n\n* libevent: Libevent: HTTP header handling bugs create risk of access control bypass. (CVE-2026-63385)\n\n* libevent: Libevent: HTTP header smuggling allows authorization bypass or cache poisoning (CVE-2026-63379)\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":"2026-09-17T06:06:39.358579Z","modified":"2026-09-17T06:30:02.4765954Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"UBUNTU-CVE-2026-63379","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:00Z","modified":"2026-10-17T13:00:32.497468909Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:56:43.630667Z"},{"id":"ALSA-2026:67909","title":"Important: libevent security update","description":"The libevent packages provide an abstract asynchronous event notification library.  \n\nSecurity Fix(es):  \n\n  * libevent: Libevent: Denial of Service via malformed RPC data (CVE-2026-63383)\n  * libevent: Libevent: Off-by-one stack buffer overflow leading to denial of service or data corruption (CVE-2026-63387)\n  * libevent: Libevent: Memory corruption due to use-after-free (CVE-2026-63381)\n  * libevent: Libevent: Denial of Service via integer conversion error in `evtag_unmarshal_header` (CVE-2026-63384)\n  * libevent ev[http:](http:) Multiple HTTP Parser Bugs Enable Request Smuggling (CVE-2026-63382)\n  * libevent: Libevent: Arbitrary code execution via heap out-of-bounds write in AF_UNIX handling (CVE-2026-63388)\n  * libevent: Libevent: HTTP header handling bugs create risk of access control bypass. (CVE-2026-63385)\n  * libevent: Libevent: HTTP header smuggling allows authorization bypass or cache poisoning (CVE-2026-63379)\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":"2026-09-16T00:00:00Z","modified":"2026-10-29T11:30:42.313849733Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"id":"ALSA-2026:67910","title":"Important: libevent security update","description":"The libevent packages provide an abstract asynchronous event notification library.  \n\nSecurity Fix(es):  \n\n  * libevent: Libevent: Denial of Service via malformed RPC data (CVE-2026-63383)\n  * libevent: Libevent: Off-by-one stack buffer overflow leading to denial of service or data corruption (CVE-2026-63387)\n  * libevent: Libevent: Memory corruption due to use-after-free (CVE-2026-63381)\n  * libevent: Libevent: Denial of Service via integer conversion error in `evtag_unmarshal_header` (CVE-2026-63384)\n  * libevent ev[http:](http:) Multiple HTTP Parser Bugs Enable Request Smuggling (CVE-2026-63382)\n  * libevent: Libevent: Arbitrary code execution via heap out-of-bounds write in AF_UNIX handling (CVE-2026-63388)\n  * libevent: Libevent: HTTP header handling bugs create risk of access control bypass. (CVE-2026-63385)\n  * libevent: Libevent: HTTP header smuggling allows authorization bypass or cache poisoning (CVE-2026-63379)\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":"2026-09-16T00:00:00Z","modified":"2026-10-29T11:32:32.034870974Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"id":"AZL-96903","title":"CVE-2026-63379 affecting package libtevent 0.14.1-1","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35Z","modified":"2026-10-22T05:37:13Z","updated_at":"2026-11-02T15:28:12.313414Z"},{"id":"AZL-96941","title":"CVE-2026-63379 affecting package libevent for versions less than 2.1.13-1","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35Z","modified":"2026-09-10T14:17:00.111957321Z","updated_at":"2026-11-02T15:28:12.313414Z"},{"id":"AZL-97533","title":"CVE-2026-63379 affecting package mysql for versions less than 8.0.46-2","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:26.280152Z"},{"id":"AZL-97557","title":"CVE-2026-63379 affecting package ntp for versions less than 4.2.8p17-3","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:26.280152Z"},{"id":"BELL-CVE-2026-63379","status":"published","published":"2026-08-22T06:05:48.153946Z","modified":"2026-09-01T07:15:05.484820575Z","updated_at":"2026-11-02T15:28:24.959902Z"},{"id":"CLSA-2026-1790587734","title":"libevent: Fix of 8 CVEs","description":"- Fix CVE-2026-63381 - use-after-free in evbuffer_add_buffer_reference()\n- Fix CVE-2026-63385 - HTTP header injection via CR/LF in header values\n- Fix CVE-2026-63382 - HTTP request smuggling via Transfer-Encoding\n  handling and bare-LF chunk framing\n- Fix CVE-2026-63379 - HTTP header smuggling via chunked trailers","status":"published","published":"2026-09-28T09:29:11Z","modified":"2026-10-26T09:43:50.580360711Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"MGASA-2026-0294","title":"Updated libevent packages fix security vulnerabilities","description":"The updated packages fix some security vulnerabilities.\n","status":"published","published":"2026-07-24T16:09:36Z","modified":"2026-07-24T16:31:20.785884066Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:12330-1","title":"libevent-2_1-7-2.1.13-1.1 on GA media","description":"These are all security issues fixed in the libevent-2_1-7-2.1.13-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-28T00:00:00Z","modified":"2026-10-29T12:15:05.385698679Z","updated_at":"2026-11-02T16:58:40.245664Z"}]}}