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A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade gnutls-develUpgrade gnutls-daneUpgrade gnutls-utilsUpgrade gnutls-c++Upgrade gnutls | May 27, 2026 | May 26, 2026 |
| Alpine Linux | — | Upgrade gnutls | May 28, 2026 | May 26, 2026 |
| Amazon_linux_2023 | — | Upgrade gnutls-debuginfoUpgrade gnutls-utilsUpgrade gnutls-debugsourceUpgrade gnutls-utils-debuginfoUpgrade gnutls-develUpgrade gnutls-c++Upgrade gnutls-dane-debuginfoUpgrade gnutls-c++-debuginfoUpgrade gnutlsUpgrade gnutls-dane | Jun 9, 2026 | May 26, 2026 |
| Debian | — | Upgrade gnutls28 | May 20, 2026 | May 20, 2026 |
| Oracle_linux | — | Upgrade gnutls-daneUpgrade gnutls-fipsUpgrade gnutls-c++Upgrade gnutls-develUpgrade gnutlsUpgrade gnutls-utils | Jun 4, 2026 | May 26, 2026 |
| Redhat_linux | — | Upgrade gnutls-fipsUpgrade gnutls-develNo solution existsUpgrade gnutls-daneUpgrade gnutls-c++Upgrade gnutls-debugsourceUpgrade gnutls-debuginfoUpgrade gnutls-utils-debuginfoUpgrade gnutls-c++-debuginfoUpgrade gnutls-dane-debuginfoUpgrade gnutls-utilsUpgrade gnutls | May 28, 2026 | Apr 29, 2026 |
| Rocky_linux | — | Upgrade gnutls-develUpgrade gnutls-c++Upgrade gnutls-c++-debuginfoUpgrade gnutls-fipsUpgrade gnutls-dane-debuginfoUpgrade gnutlsUpgrade gnutls-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-utils-debuginfoUpgrade gnutls-daneUpgrade gnutls-utils | Jun 1, 2026 | May 29, 2026 |
| Ubuntu | — | Upgrade libgnutls30Upgrade libgnutls30 (Ubuntu Pro)Upgrade libgnutls30t64 | May 25, 2026 | May 20, 2026 |
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