Vulnerability Description
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`.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.12.0, < 8.20.0 |
Related Weaknesses (CWE)
References
- https://curl.se/docs/CVE-2026-7168.htmlPatchVendor Advisory
- https://curl.se/docs/CVE-2026-7168.jsonVendor Advisory
- https://hackerone.com/reports/3697719ExploitIssue Tracking
- http://www.openwall.com/lists/oss-security/2026/04/29/14Mailing ListPatch
- https://hackerone.com/reports/3697719ExploitIssue Tracking
FAQ
What is CVE-2026-7168?
CVE-2026-7168 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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, reus...
How severe is CVE-2026-7168?
CVE-2026-7168 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-7168?
Check the references section above for vendor advisories and patch information. Affected products include: Haxx Curl.