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cross-origin Digest auth state leak

curl · CVE-2026-11856
0 news outlets0 CERTs and agencies0 researchers

What is it?

Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
9.8
EPSS
0.7%
First seen
2 d ago
Status
corroborated

All curl vulnerabilities