CVEvulnerability
CVE-2026-11856
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2026-07-03
- Last modified
- 2026-09-15
- Assigner
- 2499f714-1537-4658-8207-48ae4bb9eae9
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-294
Description
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`.
Affected configurations
• haxx curl (>= 7.10.6 < 8.21.0)
Related
Weakness · CWE (1)
- CWE-294 Authentication Bypass by Capture-replay weakness
References
- https://curl.se/docs/CVE-2026-11856.html Patch, Vendor Advisory
- https://curl.se/docs/CVE-2026-11856.json Vendor Advisory
- https://hackerone.com/reports/3793260 Exploit, Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/3793260 Exploit, Issue Tracking, Third Party Advisory