{"id":"CVE-2026-50161","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-50161","summary":"libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an…","details":"libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The expression 4 + hdr->len can wrap when hdr->len is close to UINT64_MAX, causing the mbuf_get_left() bounds check to pass. The subsequent XOR unmasking loop then writes beyond the heap buffer. Applications using websock_accept() or websock_accept_proto() to implement a WebSocket server are affected, and exploitation can cause attacker-controlled heap corruption or denial of service after the HTTP WebSocket upgrade handshake. This issue is fixed in version 4.8.1.","published":"2026-08-18T18:17:53.380","modified":"2026-08-18T18:17:53.380","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/baresip/re/commit/718b92615c7963670d26c1a2b246968b58d782e8","label":"baresip/re@718b926"},"references":[{"type":"WEB","url":"https://github.com/baresip/re/commit/718b92615c7963670d26c1a2b246968b58d782e8"},{"type":"WEB","url":"https://github.com/baresip/re/pull/1584"},{"type":"WEB","url":"https://github.com/baresip/re/releases/tag/v4.8.1"},{"type":"WEB","url":"https://github.com/baresip/re/security/advisories/GHSA-hvxv-v2gp-v93h"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T18:17:53.380"}}