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.
CVSS Details
- CVSS 3.1 Base Score: 7.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-daneUpgrade gnutls-devel | May 27, 2026 | May 26, 2026 |
| Alpine Linux | — | Upgrade gnutls | May 28, 2026 | May 26, 2026 |
| Amazon_linux_2023 | — | Upgrade gnutls-daneUpgrade gnutlsUpgrade gnutls-utilsUpgrade gnutls-dane-debuginfoUpgrade gnutls-c++Upgrade gnutls-utils-debuginfoUpgrade gnutls-debuginfoUpgrade gnutls-develUpgrade gnutls-debugsourceUpgrade gnutls-c++-debuginfo | Jun 9, 2026 | May 26, 2026 |
| Debian | — | Upgrade gnutls28 | May 20, 2026 | May 20, 2026 |
| Oracle_linux | — | Upgrade gnutls-develUpgrade gnutls-c++Upgrade gnutls-daneUpgrade gnutls-utilsUpgrade gnutls | Jun 4, 2026 | May 26, 2026 |
| Redhat_linux | — | No solution existsUpgrade gnutls-fipsUpgrade gnutls-develUpgrade gnutls-daneUpgrade gnutls-c++Upgrade gnutls-debugsourceUpgrade gnutlsUpgrade gnutls-dane-debuginfoUpgrade gnutls-utilsUpgrade gnutls-utils-debuginfoUpgrade gnutls-debuginfoUpgrade gnutls-c++-debuginfo | May 28, 2026 | Apr 29, 2026 |
| Rocky_linux | — | Upgrade gnutls-c++Upgrade gnutlsUpgrade gnutls-fipsUpgrade gnutls-develUpgrade gnutls-c++-debuginfoUpgrade gnutls-dane-debuginfoUpgrade gnutls-utilsUpgrade gnutls-daneUpgrade gnutls-debugsourceUpgrade gnutls-debuginfoUpgrade gnutls-utils-debuginfo | Jun 1, 2026 | May 29, 2026 |
| Ubuntu | — | Upgrade libgnutls30Upgrade libgnutls30 (Ubuntu Pro)Upgrade libgnutls30t64 | May 25, 2026 | May 20, 2026 |
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