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40impact

env-set cross-proxy Digest auth state leak

curl · CVE-2026-8927
0 news outlets0 CERTs and agencies0 researchers

What is it?

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`.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
9.1
EPSS
0.5%
First seen
2 d ago
Status
corroborated

All curl vulnerabilities