CVEvulnerability
CVE-2026-8927
9.1 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)
- 9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-294
Description
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`.
Affected configurations
• haxx curl (>= 7.12.0 < 8.21.0)
Related
Weakness · CWE (1)
- CWE-294 Authentication Bypass by Capture-replay weakness
References
- https://curl.se/docs/CVE-2026-8927.html Patch, Vendor Advisory
- https://curl.se/docs/CVE-2026-8927.json Vendor Advisory
- https://hackerone.com/reports/3744543 Exploit, Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/3744543 Exploit, Issue Tracking, Third Party Advisory