CVE-2026-5545
Vulnérabilité moyenne dans curl (curl)
Description
libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. An application that first uses Negotiate authentication to a server with `user1:password1` and then does another operation to the same server asking for any authentication method but for `user2:password2` (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...
Gravité et risque d'exploitation
CVE-2026-5545 obtient un score CVSS de 6.5/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.41 %, ce qui la place devant 34.2 % des CVE référencées.
Que faire ?
- Vérifiez si curl (versions 7.21.2, 7.18.0, 7.71.0, 7.16.4, 7.14.1, 7.12.1, 7.30.0, <33e43985b8f3b9e66691d06e70be0395849856cd, 7.65.3, 7.38.0, 7.45.0, 7.51.0, 7.84.0, 7.81.0, 7.37.0, 7.77.0, 7.65.2, 7.52.1, 8.1.0, 7.16.2, 7.15.2, 7.21.0, 7.16.1, 7.48.0, 7.15.3, 7.82.0, 7.19.1, 8.9.0, 7.64.1, 7.11.1, 7.13.1, 7.31.0, 7.85.0, 7.56.0, 8.11.1, 8.18.0, 7.35.0, 7.12.2, 8.4.0, 8.6.0, 7.50.2, 7.10.6, 7.78.0, 7.54.0, 7.79.1, 7.21.6, 7.28.0, 7.20.1, 8.19.0, 7.15.4, 7.18.2, 7.55.1, 7.24.0, 7.13.0, 8.12.1, 7.17.0, 7.83.0, 7.62.0, e56ae1426cb7a0a4a427cf8d6099a821fdaae428, 8.1.2, 7.42.0, 7.56.1, 7.83.1, 7.65.0, 7.49.1, 7.42.1, 7.19.3, 8.10.1, 7.69.0, 7.23.0, 7.68.0, 7.46.0, 7.53.0, 7.15.5, 7.26.0, 8.2.1, 7.12.3, 7.54.1, 7.71.1, 7.16.0, 8.3.0, 8.2.0, 7.22.0, 7.16.3, 7.57.0, 7.63.0, 8.15.0, 7.15.0, 7.19.6, 7.14.0, 7.47.0, 7.70.0, 8.1.1, 7.11.2, 7.76.1, 8.11.0, 7.50.0, 7.21.4, 7.10.8, 7.20.0, 8.12.0, 8.14.1, 7.25.0, 7.17.1, 7.12.0, 7.80.0, <8.14.2, 7.76.0, 7.60.0, 7.49.0, 7.19.0, 7.61.0, 7.19.5, 7.37.1, 7.21.3, 7.88.1, 7.32.0, 7.15.1, 7.34.0, 7.33.0, 7.61.1, 7.88.0, 7.13.2, 7.43.0, 7.86.0, 7.53.1, 8.8.0, 8.16.0, 7.66.0, 7.59.0, 7.52.0, 7.65.1, 8.7.1, 7.21.1, 7.67.0, 8.13.0, 7.10.7, 7.69.1, 7.19.4, 7.27.0, <8.20.0, <8.16.1, 7.29.0, 7.19.7, 7.55.0, 7.79.0, 8.5.0, 7.64.0, 8.14.0, 7.75.0, 7.73.0, 8.17.0, 7.72.0, 7.39.0, 8.7.0, 8.9.1, 7.47.1, 7.28.1, 8.0.0, 7.21.5, 7.87.0, 7.18.1, 7.50.3, 7.44.0, 8.10.0, 7.41.0, 7.19.2, 7.11.0, 7.50.1, 7.23.1, 8.0.1, 7.21.7, 7.40.0, 7.74.0, 7.36.0, 7.58.0) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.