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 gnutls-daneUpgrade gnutls-develUpgrade 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-develUpgrade gnutls-utilsUpgrade gnutls-c++-debuginfoUpgrade gnutls-debuginfoUpgrade gnutls-utils-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-dane-debuginfoUpgrade gnutls-c++Upgrade gnutlsUpgrade gnutls-dane | 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 gnutlsUpgrade gnutls-utils | Jun 4, 2026 | May 26, 2026 |
| Redhat_linux | — | Upgrade gnutlsUpgrade gnutls-debugsourceUpgrade gnutls-c++-debuginfoUpgrade gnutls-utils-debuginfoUpgrade gnutls-dane-debuginfoUpgrade gnutls-utilsUpgrade gnutls-debuginfoUpgrade gnutls-c++Upgrade gnutls-daneUpgrade gnutls-develNo solution existsUpgrade gnutls-fips | May 28, 2026 | Apr 29, 2026 |
| Rocky_linux | — | Upgrade gnutls-fipsUpgrade gnutlsUpgrade gnutls-develUpgrade gnutls-dane-debuginfoUpgrade gnutls-c++-debuginfoUpgrade gnutls-c++Upgrade gnutls-debugsourceUpgrade gnutls-utilsUpgrade gnutls-utils-debuginfoUpgrade gnutls-debuginfoUpgrade 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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