CVE-2026-8927
UnknownSummary
A vulnerability in libcurl causes the proxy authentication state not to be cleared between requests when reusing a handle for sequential transfers with environment-variable proxy configuration. This can leak the Proxy-Authorization header intended for one proxy to another.
Risk Assessment
The organization risks leaking authentication credentials to an unauthorized proxy server, potentially enabling unauthorized access or man-in-the-middle attacks.
Recommendation
Update libcurl to a patched version and consider explicitly clearing authentication state between transfers.
Original NVD description (English source)
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`.