Description
When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating easy handles. In OpenSSL 3 provider configurations, libcurl attaches an allocated library context to the easy handle's state and passes it to OpenSSL without acquiring an ownership reference; destroying the easy handle prematurely frees this context while the active connection retains a dangling pointer, leading to a heap-use-after-free upon subsequent I/O or post-handshake operations.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| curl | curl | >= 8.14.0, < 8.14.2; >= 8.15.0, < 8.16.1; >= 8.17.0, < 8.20.1; >= 8.21.0, < 8.22.0 |
| curl | curl | >= f2ce6c46b9dcc46ced0ce43fa95176ea7599a854, < 7ea37abc6ac0120ba5f6d94be8d196f7cf1506bb |
| curl | curl | 8.21.0; 8.20.0; 8.19.0; 8.18.0; 8.17.0; 8.16.0; 8.15.0; 8.14.1; 8.14.0 |
References
- https://curl.se/docs/CVE-2026-80229.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2026-80229.jsonVendor Advisory
- https://hackerone.com/reports/3969255Exploit, Mitigation, Third Party Advisory
Timeline
- Published
- Sep 6, 2026
- Last modified
- Sep 15, 2026
- NVD status
- Modified