{"id":"CVE-2026-63382","aliases":["ALSA-2026:67908","ALSA-2026:67909","ALSA-2026:67910","AZL-96900","AZL-96944","AZL-97536","AZL-97560","BELL-CVE-2026-63382","CLSA-2026-1790587734","CLSA-2026-1792536579","CLSA-2026-1792536927","CLSA-2026-1792537208","CLSA-2026-1792718226","DEBIAN-CVE-2026-63382","EUVD-2026-63505","GHSA-q39v-w2g7-gr8j","MGASA-2026-0294","OESA-2026-3268","RHSA-2026:63388","RHSA-2026:67908","RHSA-2026:67909","RHSA-2026:67910","RLSA-2026:67908","RLSA-2026:67909","RLSA-2026:67910","ROOT-OS-DEBIAN-11-CVE-2026-63382","ROOT-OS-DEBIAN-12-CVE-2026-63382","ROOT-OS-DEBIAN-13-CVE-2026-63382","UBUNTU-CVE-2026-63382","USN-8710-1","openSUSE-SU-2026:12330-1"],"status":"published","title":"libevent evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01991,"percentile":0.80953,"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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evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T17:51:15.156Z","modified":"2026-08-20T19:33:50.217Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N","level":"critical","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:19:55.914391Z"}],"euvd":[{"id":"EUVD-2026-63505","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T17:51:15Z","modified":"2026-08-20T19:33:50Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N","level":"critical"}],"updated_at":"2026-11-02T18:01:38.846525Z"}],"nvd":[{"id":"CVE-2026-63382","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35.7Z","modified":"2026-10-26T10:10:00.14Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/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":"critical","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:12:40.302911Z"}],"osv":[{"id":"CVE-2026-63382","title":"libevent evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T17:51:15.156Z","modified":"2026-10-29T12:27:00.938121806Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N","level":"critical"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:45:13.306117Z"},{"id":"DEBIAN-CVE-2026-63382","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35.7Z","modified":"2026-10-27T09:47:36.865308884Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/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":"critical"}],"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-2026:63388","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-09-05T10:17:40Z","modified":"2026-10-20T10:12:59Z","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":"2026-11-02T15:53:21.91255Z"},{"id":"RHSA-2026:67908","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-2026:67909","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-2026:67908","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: 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\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":"2026-09-17T12:01:09.856303Z","modified":"2026-09-17T12:30:02.604191852Z","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-2026:67909","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-2026-63382","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-21T00:00:00Z","modified":"2026-09-02T19:35:54.803844259Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N","level":"critical"}],"updated_at":"2026-11-02T16:56:43.630667Z"},{"id":"ALSA-2026:67908","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: 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\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":"2026-10-29T11:02:29.408192493Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"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-96900","title":"CVE-2026-63382 affecting package libtevent 0.14.1-1","description":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. 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-96944","title":"CVE-2026-63382 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, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","status":"published","published":"2026-08-20T18:16:35Z","modified":"2026-09-10T14:17:04.664267647Z","updated_at":"2026-11-02T15:28:12.313414Z"},{"id":"AZL-97536","title":"CVE-2026-63382 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, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. 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-97560","title":"CVE-2026-63382 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, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. 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-2026-63382","status":"published","published":"2026-08-22T06:05:48.329409Z","modified":"2026-09-01T07:15:05.48045899Z","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":"CLSA-2026-1792536579","title":"libevent: Fix of 5 CVEs","description":"- CVE-2026-63383: fix out-of-bounds read in decode_tag_internal\n- CVE-2026-63384: reject payload lengths above INT_MAX in evtag_unmarshal_header\n- CVE-2026-63387: fix off-by-one stack buffer overflow in dnsname_to_labels\n- CVE-2026-63385: reject HTTP header values containing CR or LF\n- CVE-2026-63382: reject ambiguous Transfer-Encoding/Content-Length headers and require CRLF in chunked framing","status":"published","published":"2026-10-20T22:49:53Z","modified":"2026-10-26T09:43:40.855319047Z","updated_at":"2026-11-02T15:43:54.672859Z"},{"id":"CLSA-2026-1792536927","title":"libevent: Fix of 5 CVEs","description":"- CVE-2026-63383: fix out-of-bounds read in decode_tag_internal\n- CVE-2026-63384: reject payload lengths above INT_MAX in evtag_unmarshal_header\n- CVE-2026-63387: fix off-by-one stack buffer overflow in dnsname_to_labels\n- CVE-2026-63385: reject HTTP header values containing CR or LF\n- CVE-2026-63382: reject ambiguous Transfer-Encoding/Content-Length headers and require CRLF in chunked framing","status":"published","published":"2026-10-21T20:41:21Z","modified":"2026-10-26T09:43:55.312646955Z","updated_at":"2026-11-02T15:43:54.672859Z"},{"id":"CLSA-2026-1792537208","title":"libevent: Fix of 5 CVEs","description":"- CVE-2026-63383: fix out-of-bounds read in decode_tag_internal\n- CVE-2026-63384: reject payload lengths above INT_MAX in evtag_unmarshal_header\n- CVE-2026-63387: fix off-by-one stack buffer overflow in dnsname_to_labels\n- CVE-2026-63385: reject HTTP header values containing CR or LF\n- CVE-2026-63382: reject ambiguous Transfer-Encoding/Content-Length headers and require CRLF in chunked framing","status":"published","published":"2026-10-20T23:00:22Z","modified":"2026-10-26T09:43:29.931742472Z","updated_at":"2026-11-02T15:43:54.672859Z"},{"id":"CLSA-2026-1792718226","title":"libevent: Fix of 6 CVEs","description":"- CVE-2026-63382: reject ambiguous Transfer-Encoding/Content-Length headers and require CRLF in chunked framing","status":"published","published":"2026-10-23T01:17:20Z","modified":"2026-10-26T09:31:55.15737902Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"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"},{"id":"ROOT-OS-DEBIAN-11-CVE-2026-63382","title":"CVE-2026-63382 in libevent - Patched by Root","description":"Root has patched CVE-2026-63382 in the libevent package for Root:Debian:11. Multiple fixed versions available.","status":"published","published":"2026-09-16T09:41:22Z","modified":"2026-09-16T10:15:04.320667168Z","updated_at":"2026-11-02T15:53:30.44348Z"},{"id":"ROOT-OS-DEBIAN-12-CVE-2026-63382","title":"CVE-2026-63382 in libevent - Patched by Root","description":"Root has patched CVE-2026-63382 in the libevent package for Root:Debian:12. Multiple fixed versions available.","status":"withdrawn","published":"2026-08-31T12:50:37Z","modified":"2026-10-09T13:00:14.109707053Z","updated_at":"2026-11-02T15:53:32.570806Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2026-63382","title":"CVE-2026-63382 in libevent - Patched by Root","description":"Root has patched CVE-2026-63382 in the libevent package for Root:Debian:13. Multiple fixed versions available.","status":"withdrawn","published":"2026-08-31T06:15:59Z","modified":"2026-10-08T19:00:07.690560635Z","updated_at":"2026-11-02T15:53:33.681527Z"},{"id":"USN-8710-1","title":"libevent vulnerabilities","description":"Alexis Challande discovered that libevent incorrectly handled certain\nempty output buffers. An attacker could possibly use this issue to\ntrigger a use-after-free, resulting in a denial of service or arbitrary\ncode execution. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04\nLTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n(CVE-2026-63381)\n\nRajat Raghav discovered that libevent incorrectly handled certain HTTP\nrequests. An attacker could possibly use this issue to desynchronize\nHTTP request boundaries, resulting in HTTP request smuggling.\n(CVE-2026-63382)\n\nQiu Sihao discovered that libevent incorrectly handled certain malformed\ntagged RPC data. An attacker could possibly use this issue to trigger an\nout-of-bounds read, resulting in a denial of service. (CVE-2026-63383)\n\nQiu Sihao discovered that libevent incorrectly handled certain large\npayload lengths in tagged RPC data. An attacker could possibly use this\nissue to consume excessive system resources, resulting in a denial of\nservice. (CVE-2026-63384)\n\nAsaf Meizner discovered that libevent incorrectly handled certain HTTP\nURIs and header values. An attacker could possibly use this issue to\ncause HTTP messages to be interpreted inconsistently, resulting in\nsecurity restrictions being bypassed. (CVE-2026-63385)","status":"published","published":"2026-09-01T15:27:40Z","modified":"2026-09-02T02:41:27.937895154Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}