libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse.
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.
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:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Jul 6, 2026 | Jul 3, 2026 |
| Amazon_linux_2023 | — | Upgrade curl-debugsourceUpgrade libcurl-develUpgrade curl-minimalUpgrade curl-debuginfoUpgrade curlUpgrade libcurl-debuginfoUpgrade libcurl-minimal-debuginfoUpgrade libcurl-minimalUpgrade libcurlUpgrade curl-minimal-debuginfo | Sep 30, 2026 | Jul 3, 2026 |
| Ibm Aix | — | Apply the fix or workaround for curl_advisory11 | Jul 28, 2026 | Jul 28, 2026 |
| Redhat_linux | — | Upgrade curl-debuginfoUpgrade libcurl-develUpgrade curl-debugsourceUpgrade libcurl-debuginfoUpgrade libcurlUpgrade curlUpgrade libcurl-minimal-debuginfoNo solution existsUpgrade libcurl-minimal | Aug 4, 2026 | Jul 3, 2026 |
| Rocky_linux | — | Upgrade libcurl-debuginfoUpgrade libcurlUpgrade libcurl-develUpgrade curlUpgrade curl-debuginfoUpgrade libcurl-minimalUpgrade curl-debugsourceUpgrade libcurl-minimal-debuginfo | Sep 28, 2026 | Sep 22, 2026 |
| Ubuntu | — | Upgrade curl (Ubuntu Pro)Upgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl3-nss (Ubuntu Pro)Upgrade libcurl3-nssUpgrade libcurl4-nss-devUpgrade libcurl4Upgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade libcurl4-gnutls-devUpgrade libcurl3t64-gnutlsUpgrade libcurl4 (Ubuntu Pro)Upgrade libcurl4t64Upgrade curlUpgrade libcurl4-gnutls-dev (Ubuntu Pro)Upgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl3-gnutlsUpgrade libcurl4-openssl-dev | Aug 25, 2026 | Aug 24, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 10, 2026 | Jul 3, 2026 |
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