{"api_version":"1","generated_at":"2026-10-01T17:26:02+00:00","cve":"CVE-2026-50161","urls":{"html":"https://cve.report/CVE-2026-50161","api":"https://cve.report/api/cve/CVE-2026-50161.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-50161","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-50161"},"summary":{"title":"libre: Integer overflow in websock_decode() masked frame length check leads to heap buffer overflow","description":"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.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-08-18 18:17:53","updated_at":"2026-09-18 20:09:01"},"problem_types":["CWE-190","CWE-787","CWE-190 CWE-190: Integer Overflow or Wraparound","CWE-787 CWE-787: Out-of-bounds 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