CVE-2026-63381
Libevent: Dangling Pointer in `evbuffer_add_buffer_reference`
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 a use-after-free in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero. evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer. A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
| CWE | CWE-908 |
| Vendor | libevent |
| Product | libevent |
| Published | Aug 20, 2026 |
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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-c2pj-cg4r-88c8 github.com: https://github.com/libevent/libevent/commit/5cb95ba2f804f8aff46f88d58391c71e1251cd1c github.com: https://github.com/libevent/libevent/commit/9db091b04f569be3a700fa9860ef02f90b830af9 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