CVE-2026-63384 — Libevent: `evtag_unmarshal_header()` decodes a wire `uint32` length into a signed `int` return value.
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event_tagging.c when evtag_unmarshal_header uses evta…
Published: 2026-08-20 · CVSS: 8.7 · CVSS 4.0
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event_tagging.c when evtag_unmarshal_header uses evtag_decode_int to decode an attacker-controlled uint32 payload length and returns it as a signed int. Values above INT_MAX become negative or truncated, and evtag_unmarshal_string can use the converted value in allocation sizing, producing a wrapped large allocation request and denial of service. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7