CVE-2026-11564
Last modified
CVE-2026-11564 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
Description
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 8.17.0, < 8.21.0 |
References
- https://curl.se/docs/CVE-2026-11564.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2026-11564.jsonVendor Advisory
- https://hackerone.com/reports/3788984Exploit, Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/3788984Exploit, Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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.
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- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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