CVE-2026-33630
CVE-2026-33630 · c-ares : Use-after-free / double-free in c-ares query-completion handling, remotely triggerable via ares_getaddrinfo() over TCP
Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.
c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup structures — is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 1.34.7.
CVSS 7.5 · Alta · EPSS 0,8% · Corrección disponible
- Publicación
- Actualización
Pila tecnológica: system
Productos y versiones afectados
c-ares
- Versiones
- >= 1.32.3, < 1.34.7: Afectada
Sin corrección publicada
c-ares Debian:13
- Versiones
- 1.34.5-1
- 1.34.5-1+deb13u1
- 1.34.6-1
- 1.34.7-1
- 1.34.8-1
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
c-ares Debian:14
- Versiones
- 1.34.5-1
- 1.34.6-1
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.34.7-1
Actualiza a 1.34.7-1
c-ares Ubuntu:25.10
- Versiones
- 1.34.4-2.1
- 1.34.5-1
- 1.34.5-1ubuntu0.1
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
c-ares Ubuntu:26.04:LTS
- Versiones
- 1.34.5-1
- 1.34.6-1
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.34.6-1ubuntu0.1
Actualiza a 1.34.6-1ubuntu0.1
Fuentes originales
- https://github.com/c-ares/c-ares/security/advisories/GHSA-6wfj-rwm7-3542
- https://github.com/c-ares/c-ares/pull/1237
- https://github.com/c-ares/c-ares/commit/1fa3b86a0b8d18fe7b60f3228a01d770feb026bc
- https://github.com/c-ares/c-ares/commit/d823199b688052dcdc1646f2ab4cb8c16b1c644a
- https://github.com/c-ares/c-ares/releases/tag/v1.34.7
- https://nvd.nist.gov/vuln/detail/CVE-2026-33630