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AlienVault OTX Malware

libevent

Libevent versions prior to 2.2.2-alpha contain a vulnerability in ws.c where invalid list pointers can be dereferenced during error handling in evws_new_session. This occurs when evhttp_start_ws_ succeeds but bufferevent_enable_locking_ fails, leading to a call to TAILQ_REMOVE on a session not inserted into the session list. This can cause a process crash. The issue is fixed in version 2.2.2-alpha.

Libevent is an event notification library. In versions before 2.2.2-alpha, a flaw exists in the WebSocket session handling code (ws.c). Specifically, if evws_new_session enters its error path after evhttp_start_ws_ succeeds but bufferevent_enable_locking_ fails, evws_connection_free unconditionally calls TAILQ_REMOVE on a non-null http_server pointer. Since the session was never inserted into http_server->ws_sessions, this leads to dereferencing invalid list pointers. A local attacker able to trigger this allocation or locking failure can cause the process to crash. The vulnerability is resolved in libevent version 2.2.2-alpha.

Detailed information about Libevent: Prior to 2.2.2-alpha, libev ...) (CVE-2026-63380) affecting null libevent. Get real-time updates, technical details, and mi

Libevent: Prior to 2.2.2-alpha, libev ...) (CVE-2026-63380) - Live Threat Intelligence - Threat Radar | OffSeq.com

Prior to 2.2.2-alpha, libevent can dereference invalid list pointers in ws.c when evws_new_session enters its error path after evhttp_start_ws_… (CVE-2026-63380)

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