CVE-2026-7168

Summary

Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and then changing the proxy host to a second one (`proxyB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Proxy-Authorization:` header field meant for `proxyA`, to `proxyB`.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://curl.se/docs/CVE-2026-7168.html ↗

Additional information

• NVD record
• https://curl.se/docs/CVE-2026-7168.htmlPatch
• http://www.openwall.com/lists/oss-security/2026/04/29/14Patch
• https://curl.se/docs/CVE-2026-7168.jsonAdvisory
• https://hackerone.com/reports/3697719Exploit