cvedb.io
CVE-2026-5545
MEDIUM · CVSS 6.5
EPSS exploitation probability: 0%
Published 2026-05-13T13:01:56.190 · Last modified 2026-06-17T10:59:12.847

Summary

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

Affected products

haxx — curl

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.