CVE-2026-80229

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.

References

• curl.se/docs/CVE-2026-80229.html · Patch, Vendor Advisory
• curl.se/docs/CVE-2026-80229.json · Vendor Advisory
• hackerone.com/reports/3969255 · Exploit, Mitigation, Third Party Advisory