CVE-2026-63384
Libevent: `evtag_unmarshal_header()` decodes a wire `uint32` length into a signed `int` return value.
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-190 |
| Vendor | libevent |
| Product | libevent |
| Published | Aug 20, 2026 |
| Last Updated | Aug 20, 2026 |
Stay Ahead of the Next One
Get instant alerts for libevent libevent
Be the first to know when new unknown vulnerabilities affecting libevent libevent are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
libevent / libevent
>= 2.2.0-alpha, < 2.2.2-alpha < 2.1.13
References
github.com: https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8 github.com: https://github.com/libevent/libevent/commit/109c16499282959d70f56ec3baf4c8b1e6646bda github.com: https://github.com/libevent/libevent/commit/5e3c6ebe342b34c5a9bcf48e9a32ad6708b9c416 github.com: https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable github.com: https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha