CVE-2026-19931
Last modified
CVE-2026-19931 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.16% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.64.1, < 8.22.0 |
References
- https://curl.se/docs/CVE-2026-19931.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2026-19931.jsonVendor Advisory
- https://hackerone.com/reports/3923520Exploit, Mitigation, Third Party Advisory
- https://hackerone.com/reports/3923520Exploit, Mitigation, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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