CVE-2026-63388
Przepełnienie bufora w libevent umożliwia lokalnemu atakującemu korupcję pamięci.
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
| Źródło | Wartość |
|---|---|
| NVD – CVSS | 8.4 |
| CISA KEV (aktywnie wykorzystywane) | Nie |
| FIRST EPSS (prawdopodobieństwo exploita) | 0.1% |
| Opublikowano (NVD) | 2026-08-20 18:16:36 UTC |
| Ostatnia modyfikacja (NVD) | 2026-08-21 22:16:42 UTC |
- https://github.com/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9 (security-advisories@github.com)
- https://github.com/libevent/libevent/commit/ef38f926e9cd1f082416c6fff13587bc1f431d72 (security-advisories@github.com)
- https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable (security-advisories@github.com)
- https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha (security-advisories@github.com)
- https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338 (security-advisories@github.com)