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 9.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| curl | curl | >= 8.17.0, < 8.20.1 |
| curl | curl | >= eefd03c572996e5de4dec4fe295ad6f103e0eefc, < d69bfad3fa3daf5e72331f6870667607828d5891 |
| curl | curl | 8.20.0; 8.19.0; 8.18.0; 8.17.0 |
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
- Jul 3, 2026
- Last modified
- Sep 15, 2026
- NVD status
- Modified