{"id":"CVE-2026-63383","aliases":["GHSA-fj29-64w6-73h6"],"url":"https://o3.security/vulnerability/CVE-2026-63383","summary":"Libevent: decode_tag_internal() can lead to out-of-bounds read","details":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","published":"2026-08-20T17:48:24.568Z","modified":"2026-08-22T03:58:08.682688129Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321","label":"libevent/libevent@91ed874"},"references":[{"type":"WEB","url":"https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"},{"type":"WEB","url":"https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63383.json"},{"type":"ADVISORY","url":"https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63383"},{"type":"FIX","url":"https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321"},{"type":"FIX","url":"https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc75180cb"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-22T03:58:08.682688129Z"}}