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.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Sep 7, 2026 | Sep 6, 2026 |
| Ubuntu | — | Upgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl4-gnutls-devUpgrade libcurl4 (Ubuntu Pro)Upgrade libcurl3-nss (Ubuntu Pro)Upgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl4Upgrade libcurl4-gnutls-dev (Ubuntu Pro)Upgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade curl (Ubuntu Pro)Upgrade libcurl4-nss-devUpgrade libcurl3 (Ubuntu Pro)Upgrade libcurl4t64Upgrade libcurl3-nssUpgrade curlUpgrade libcurl3t64-gnutlsUpgrade libcurl3-gnutlsUpgrade libcurl4-openssl-dev | Sep 27, 2026 | Sep 24, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 24, 2026 | Sep 6, 2026 |
Prioritize with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub