A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.
CVSS Details
- CVSS 3.1 Base Score: 8.2
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade gnutls-utilsUpgrade gnutls-develUpgrade gnutls-c++Upgrade gnutlsUpgrade gnutls-dane | May 27, 2026 | May 26, 2026 |
| Alpine Linux | — | Upgrade gnutls | May 28, 2026 | May 26, 2026 |
| Amazon_linux_2023 | — | Upgrade gnutls-debugsourceUpgrade gnutls-dane-debuginfoUpgrade gnutls-utils-debuginfoUpgrade gnutls-utilsUpgrade gnutls-c++Upgrade gnutls-c++-debuginfoUpgrade gnutls-daneUpgrade gnutls-develUpgrade gnutls-debuginfoUpgrade gnutls | Jun 9, 2026 | May 26, 2026 |
| Debian | — | Upgrade gnutls28 | May 20, 2026 | May 20, 2026 |
| Oracle_linux | — | Upgrade gnutls-develUpgrade gnutlsUpgrade gnutls-daneUpgrade gnutls-c++Upgrade gnutls-utils | Jun 4, 2026 | May 26, 2026 |
| Redhat Openshift | — | Upgrade rhcos | Aug 10, 2026 | Apr 29, 2026 |
| Redhat_linux | — | Upgrade gnutls-c++Upgrade gnutlsUpgrade gnutls-debugsourceNo solution existsUpgrade gnutls-utils-debuginfoUpgrade gnutls-debuginfoUpgrade gnutls-utilsUpgrade gnutls-daneUpgrade gnutls-fipsUpgrade gnutls-dane-debuginfoUpgrade gnutls-c++-debuginfoUpgrade gnutls-devel | May 28, 2026 | Apr 29, 2026 |
| Rocky_linux | — | Upgrade gnutls-c++Upgrade gnutls-dane-debuginfoUpgrade gnutls-utilsUpgrade gnutls-utils-debuginfoUpgrade gnutlsUpgrade gnutls-daneUpgrade gnutls-debugsourceUpgrade gnutls-c++-debuginfoUpgrade gnutls-fipsUpgrade gnutls-develUpgrade gnutls-debuginfo | Jun 1, 2026 | May 29, 2026 |
| Ubuntu | — | Upgrade libgnutls30 (Ubuntu Pro)Upgrade libgnutls30Upgrade libgnutls30t64 | May 25, 2026 | May 20, 2026 |
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