Security Advisory
CVE-2026-8927
9.1
CRITICAL
Vulnerability Description
When reusing a libcurl handle for sequential transfers driven by
environment-variable proxy configuration, libcurl fails to clear the proxy
authentication state between requests. Specifically, if the initial transfer
authenticates against `proxyA` using Digest auth, a subsequent transfer routed
through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended
solely for `proxyA`.
Published Date
July 3, 2026
Official Source
NIST NVD Advisory