A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade gnutlsUpgrade gnutls-c++Upgrade gnutls-utilsUpgrade gnutls-develUpgrade gnutls-dane | May 27, 2026 | May 26, 2026 |
| Alpine Linux | — | Upgrade gnutls | May 4, 2026 | Apr 30, 2026 |
| Amazon_linux_2023 | — | Upgrade gnutls-dane-debuginfoUpgrade gnutlsUpgrade gnutls-daneUpgrade gnutls-c++-debuginfoUpgrade gnutls-utils-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-utilsUpgrade gnutls-c++Upgrade gnutls-develUpgrade gnutls-debuginfo | May 28, 2026 | Apr 30, 2026 |
| Debian | — | Upgrade gnutls28 | May 20, 2026 | May 20, 2026 |
| Oracle_linux | — | Upgrade gnutlsUpgrade gnutls-utilsUpgrade gnutls-develUpgrade gnutls-daneUpgrade gnutls-c++ | Jun 4, 2026 | Apr 30, 2026 |
| Redhat Openshift | — | Upgrade ose-rhel-coreos | Aug 27, 2026 | Apr 30, 2026 |
| Redhat_linux | — | Upgrade gnutls-debugsourceUpgrade gnutls-daneUpgrade gnutls-develUpgrade gnutlsUpgrade gnutls-utilsUpgrade gnutls-debuginfoUpgrade gnutls-c++Upgrade gnutls-c++-debuginfoUpgrade gnutls-utils-debuginfoUpgrade gnutls-dane-debuginfoUpgrade gnutls-fips | May 28, 2026 | Apr 30, 2026 |
| Rocky_linux | — | Upgrade gnutls-c++-debuginfoUpgrade gnutls-develUpgrade gnutls-debuginfoUpgrade gnutls-fipsUpgrade gnutls-daneUpgrade gnutls-dane-debuginfoUpgrade gnutlsUpgrade gnutls-utilsUpgrade gnutls-utils-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-c++ | Jun 1, 2026 | May 29, 2026 |
| Suse | — | Upgrade libgnutls28Upgrade libgnutls28-32bitUpgrade libgnutls-devel-docUpgrade libgnutls30-hmacUpgrade libgnutlsxx30Upgrade libgnutlsxx-develUpgrade libgnutls-develUpgrade libgnutls30-32bitUpgrade gnutls-guileUpgrade libgnutls30Upgrade gnutlsUpgrade libgnutls-openssl-develUpgrade libgnutls-openssl27Upgrade libgnutls30-hmac-32bitUpgrade libgnutlsxx28 | May 27, 2026 | May 27, 2026 |
| Ubuntu | — | Upgrade libgnutlsxx28 (Ubuntu Pro)Upgrade libgnutls30Upgrade gnutls-bin (Ubuntu Pro)Upgrade libgnutls30 (Ubuntu Pro)Upgrade guile-gnutls (Ubuntu Pro)Upgrade libgnutls-openssl27 (Ubuntu Pro)Upgrade libgnutls-dev (Ubuntu Pro)Upgrade libgnutls-dane0 (Ubuntu Pro)Upgrade libgnutls28-dev (Ubuntu Pro)Upgrade libgnutls30t64 | May 25, 2026 | May 20, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Apr 30, 2026 |
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