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 gnutlsUpgrade gnutls-utilsUpgrade gnutls-c++Upgrade gnutls-develUpgrade gnutls-dane | May 27, 2026 | May 26, 2026 |
| Alpine Linux | — | Upgrade gnutls | May 28, 2026 | May 26, 2026 |
| Amazon_linux_2023 | — | Upgrade gnutls-utils-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-dane-debuginfoUpgrade gnutls-utilsUpgrade gnutls-c++Upgrade gnutls-c++-debuginfoUpgrade gnutls-debuginfoUpgrade gnutls-develUpgrade gnutlsUpgrade gnutls-dane | Jun 9, 2026 | May 26, 2026 |
| Debian | — | Upgrade gnutls28 | May 20, 2026 | May 20, 2026 |
| Oracle_linux | — | Upgrade gnutls-utilsUpgrade gnutls-c++Upgrade gnutls-develUpgrade gnutlsUpgrade gnutls-daneUpgrade gnutls-fips | Jun 4, 2026 | May 26, 2026 |
| Redhat Openshift | — | Upgrade ose-rhel-coreos | Aug 10, 2026 | Apr 29, 2026 |
| Redhat_linux | — | Upgrade gnutls-develUpgrade gnutls-c++-debuginfoUpgrade gnutls-fipsUpgrade gnutls-dane-debuginfoUpgrade gnutls-utils-debuginfoUpgrade gnutls-daneUpgrade gnutls-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-c++Upgrade gnutlsUpgrade gnutls-utilsNo solution exists | May 28, 2026 | Apr 29, 2026 |
| Rocky_linux | — | Upgrade gnutls-dane-debuginfoUpgrade gnutls-utilsUpgrade gnutls-c++Upgrade gnutls-c++-debuginfoUpgrade gnutls-develUpgrade gnutls-fipsUpgrade gnutlsUpgrade gnutls-utils-debuginfoUpgrade gnutls-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-dane | Jun 1, 2026 | May 29, 2026 |
| Ubuntu | — | Upgrade libgnutls30t64Upgrade libgnutls30 (Ubuntu Pro)Upgrade libgnutls30 | May 25, 2026 | May 20, 2026 |
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