CVE-2026-63382
CVE-2026-63382 · libevent evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling
Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
CVSS 9.2 · Critique · EPSS 0,8% · Correctif disponible
- Publication
- Mise à jour
Pile logicielle: system
Produits et versions concernés
libevent
- Versions du logiciel
- >= 2.2.0-alpha, < 2.2.2-alpha: Concernée
- < 2.1.13: Concernée
Aucun correctif publié
libevent Debian:12
- Versions du logiciel
- 2.1.12-stable-8
- Plages de versions concernées
- ECOSYSTEM: < 2.1.12-stable-8+deb12u1
Mettez à jour vers 2.1.12-stable-8+deb12u1
libevent Debian:13
- Versions du logiciel
- 2.1.12-stable-10
- Plages de versions concernées
- ECOSYSTEM: < 2.1.13-stable-1~deb13u1
Mettez à jour vers 2.1.13-stable-1~deb13u1
libevent Debian:14
- Versions du logiciel
- 2.1.12-stable-10
- 2.1.13-stable-1~deb13u1
- Plages de versions concernées
- ECOSYSTEM: < 2.1.13-stable-1
Mettez à jour vers 2.1.13-stable-1
libevent Ubuntu:Pro:14.04:LTS
- Versions du logiciel
- 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
- Plages de versions concernées
- ECOSYSTEM: < 2.0.21-stable-1ubuntu1.14.04.2+esm1
Mettez à jour vers 2.0.21-stable-1ubuntu1.14.04.2+esm1
libevent Ubuntu:Pro:16.04:LTS
- Versions du logiciel
- 2.0.21-stable-2
- 2.0.21-stable-2ubuntu0.16.04.1
- Plages de versions concernées
- ECOSYSTEM: < 2.0.21-stable-2ubuntu0.16.04.1+esm1
Mettez à jour vers 2.0.21-stable-2ubuntu0.16.04.1+esm1
libevent Ubuntu:Pro:18.04:LTS
- Versions du logiciel
- 2.1.8-stable-4
- 2.1.8-stable-4build1
- Plages de versions concernées
- ECOSYSTEM: < 2.1.8-stable-4ubuntu0.1~esm1
Mettez à jour vers 2.1.8-stable-4ubuntu0.1~esm1
libevent Ubuntu:Pro:20.04:LTS
- Versions du logiciel
- 2.1.8-stable-4build1
- 2.1.11-stable-1~exp0
- 2.1.11-stable-1
- Plages de versions concernées
- ECOSYSTEM: < 2.1.11-stable-1ubuntu0.1~esm1
Mettez à jour vers 2.1.11-stable-1ubuntu0.1~esm1
libevent Ubuntu:22.04:LTS
- Versions du logiciel
- 2.1.12-stable-1
- 2.1.12-stable-1build1
- 2.1.12-stable-1build2
- 2.1.12-stable-1build3
- Plages de versions concernées
- ECOSYSTEM: < 2.1.12-stable-1ubuntu0.1
Mettez à jour vers 2.1.12-stable-1ubuntu0.1
libevent Ubuntu:24.04:LTS
- Versions du logiciel
- 2.1.12-stable-9
- 2.1.12-stable-9ubuntu2
- Plages de versions concernées
- ECOSYSTEM: < 2.1.12-stable-9ubuntu2.1
Mettez à jour vers 2.1.12-stable-9ubuntu2.1
libevent Ubuntu:26.04:LTS
- Versions du logiciel
- 2.1.12-stable-10build1
- 2.1.12-stable-10build2
- Plages de versions concernées
- ECOSYSTEM: < 2.1.12-stable-10ubuntu0.1
Mettez à jour vers 2.1.12-stable-10ubuntu0.1
Sources originales
- https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j
- https://github.com/libevent/libevent/commit/10abb34b8dc3e1184de315dd261ce4b77563cda6
- https://github.com/libevent/libevent/commit/5119ceb00557bf007f9065709e852686f3c0bb6e
- https://github.com/libevent/libevent/commit/83ba67373032334559b82409db035dd8c3cc1660
- https://github.com/libevent/libevent/commit/ac38703b2d312200c4f967f02936af0118d384a0
- 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-2026-63382