CVE-2026-63495: Libevent Ws Unbounded Fragment Accumulation

Fragmented WebSocket frames or network data are accumulated into an evbuffer without checking the cumulative message length against a maximum size limit. An attacker can send endless fragments to exhaust memory (DoS).

Provally CuratedPublic repositoryMediumMedium confidenceVerifiedApache-2.0C
greprules fetch cve-2026-63495-libevent-ws-unbounded-fragment-accumulation --engine opengrep

Description

Fragmented WebSocket frames or network data are accumulated into an evbuffer without checking the cumulative message length against a maximum size limit. An attacker can send endless fragments to exhaust memory (DoS).