libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services".
libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.
When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libcurlUpgrade libcurl-minimalUpgrade curl-minimalUpgrade curlUpgrade libcurl-devel | Oct 11, 2026 | Sep 21, 2026 |
| Alpine Linux | — | Upgrade curl | Jul 6, 2026 | Jul 3, 2026 |
| Amazon_linux_2023 | — | Upgrade curlUpgrade curl-minimalUpgrade libcurl-develUpgrade libcurl-debuginfoUpgrade libcurl-minimalUpgrade libcurlUpgrade curl-debugsourceUpgrade libcurl-minimal-debuginfoUpgrade curl-minimal-debuginfoUpgrade curl-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 libcurlUpgrade libcurl-debuginfoUpgrade curl-minimalNo solution existsUpgrade libcurl-minimalUpgrade curl-debugsourceUpgrade curl-minimal-debuginfoUpgrade curlUpgrade libcurl-minimal-debuginfoUpgrade libcurl-develUpgrade curl-debuginfo | Aug 10, 2026 | Jul 3, 2026 |
| Rocky_linux | — | Upgrade curl-minimal-debuginfoUpgrade curl-debuginfoUpgrade curl-debugsourceUpgrade curlUpgrade libcurlUpgrade libcurl-develUpgrade libcurl-debuginfoUpgrade libcurl-minimalUpgrade libcurl-minimal-debuginfoUpgrade curl-minimal | Sep 28, 2026 | Sep 22, 2026 |
| Ubuntu | — | Upgrade curl (Ubuntu Pro)Upgrade libcurl3 (Ubuntu Pro)Upgrade libcurl3-gnutlsUpgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl3-nss (Ubuntu Pro)Upgrade libcurl4-gnutls-dev (Ubuntu Pro)Upgrade libcurl4 (Ubuntu Pro)Upgrade libcurl4-gnutls-devUpgrade libcurl3t64-gnutlsUpgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl4-openssl-devUpgrade libcurl4t64Upgrade libcurl3-nssUpgrade curlUpgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade libcurl4-nss-devUpgrade libcurl4 | Jul 1, 2026 | Jun 30, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 10, 2026 | Jul 3, 2026 |
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