A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Jun 18, 2026 | May 13, 2026 |
| Debian | — | Upgrade curl | Jul 23, 2026 | Jul 23, 2026 |
| Ibm Aix | — | Apply the fix or workaround for curl_advisory12 | Sep 21, 2026 | Sep 21, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Apr 29, 2026 |
| Suse | — | Upgrade curl-fish-completionUpgrade libcurl-develUpgrade libcurl4Upgrade curlUpgrade libcurl-devel-docUpgrade libcurl-mini4Upgrade libcurl4-32bitUpgrade curl-zsh-completion | May 26, 2026 | May 6, 2026 |
| Ubuntu | — | Upgrade libcurl3t64-gnutlsUpgrade libcurl3-nssUpgrade curlUpgrade libcurl4t64Upgrade libcurl4Upgrade libcurl3-gnutls | May 4, 2026 | Apr 29, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 13, 2026 |
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