CVEvulnerability
CVE-2026-19931
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2026-09-06
- 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-488
Description
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given
hostname using Negotiate authentication, when the initial request is done
using empty credentials. This can make user B's request get sent over user A's
previously authenticated connection.
Affected configurations
• haxx curl (>= 7.64.1 < 8.22.0)
Related
Weakness · CWE (1)
- CWE-488 Exposure of Data Element to Wrong Session weakness
References
- https://curl.se/docs/CVE-2026-19931.html Patch, Vendor Advisory
- https://curl.se/docs/CVE-2026-19931.json Vendor Advisory
- https://hackerone.com/reports/3923520 Exploit, Mitigation, Third Party Advisory
- https://hackerone.com/reports/3923520 Exploit, Mitigation, Third Party Advisory