CVE-2026-63379
CVE-2026-63379 · Libevent: HTTP Header smuggling
Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req->input_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
CVSS 6.3 · Media · EPSS 0,7% · Corrección disponible
- Publicación
- Actualización
Pila tecnológica: system
Productos y versiones afectados
libevent
- Versiones
- < 2.1.13: Afectada
- >= 2.2.0-alpha, < 2.2.2-alpha: Afectada
Sin corrección publicada
libevent Debian:12
- Versiones
- 2.1.12-stable-8
- Intervalos de versiones afectados
- ECOSYSTEM: < 2.1.12-stable-8+deb12u1
Actualiza a 2.1.12-stable-8+deb12u1
libevent Debian:13
- Versiones
- 2.1.12-stable-10
- Intervalos de versiones afectados
- ECOSYSTEM: < 2.1.13-stable-1~deb13u1
Actualiza a 2.1.13-stable-1~deb13u1
libevent Debian:14
- Versiones
- 2.1.12-stable-10
- 2.1.13-stable-1~deb13u1
- Intervalos de versiones afectados
- ECOSYSTEM: < 2.1.13-stable-1
Actualiza a 2.1.13-stable-1
libevent Ubuntu:Pro:14.04:LTS
- Versiones
- 2.0.21-stable-1
- 2.0.21-stable-1ubuntu1
- 2.0.21-stable-1ubuntu1.14.04.1
- 2.0.21-stable-1ubuntu1.14.04.2
- 2.0.21-stable-1ubuntu1.14.04.2+esm1
- 2.0.21-stable-1ubuntu1.14.04.2+esm2
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
libevent Ubuntu:Pro:16.04:LTS
- Versiones
- 2.0.21-stable-2
- 2.0.21-stable-2ubuntu0.16.04.1
- 2.0.21-stable-2ubuntu0.16.04.1+esm1
- 2.0.21-stable-2ubuntu0.16.04.1+esm2
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
libevent Ubuntu:Pro:18.04:LTS
- Versiones
- 2.1.8-stable-4
- 2.1.8-stable-4build1
- 2.1.8-stable-4ubuntu0.1~esm1
- 2.1.8-stable-4ubuntu0.1~esm2
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
libevent Ubuntu:Pro:20.04:LTS
- Versiones
- 2.1.8-stable-4build1
- 2.1.11-stable-1~exp0
- 2.1.11-stable-1
- 2.1.11-stable-1ubuntu0.1~esm1
- 2.1.11-stable-1ubuntu0.1~esm2
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
libevent Ubuntu:22.04:LTS
- Versiones
- 2.1.12-stable-1
- 2.1.12-stable-1build1
- 2.1.12-stable-1build2
- 2.1.12-stable-1build3
- 2.1.12-stable-1ubuntu0.1
- 2.1.12-stable-1ubuntu0.2
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
libevent Ubuntu:24.04:LTS
- Versiones
- 2.1.12-stable-9
- 2.1.12-stable-9ubuntu2
- 2.1.12-stable-9ubuntu2.1
- 2.1.12-stable-9ubuntu2.2
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
libevent Ubuntu:26.10
- Versiones
- 2.1.12-stable-10build2
- 2.1.13-stable-1build1
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
libevent Ubuntu:26.04:LTS
- Versiones
- 2.1.12-stable-10build1
- 2.1.12-stable-10build2
- 2.1.12-stable-10ubuntu0.1
- 2.1.12-stable-10ubuntu0.2
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
Fuentes originales
- https://github.com/libevent/libevent/security/advisories/GHSA-2gmv-p5m7-98p6
- https://github.com/libevent/libevent/commit/87e8e44fa774e9677b089b1a5114ee68aefa1636
- https://github.com/libevent/libevent/commit/b847071141b3827900d536594ec9045eb0a4c485
- https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable
- https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha
- https://nvd.nist.gov/vuln/detail/CVE-2026-63379