A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade gnutls-c++Upgrade gnutls-develUpgrade gnutls-utilsUpgrade gnutlsUpgrade gnutls-dane | May 27, 2026 | May 26, 2026 |
| Alpine Linux | — | Upgrade gnutls | May 8, 2026 | May 7, 2026 |
| Amazon_linux_2023 | — | Upgrade gnutls-c++Upgrade gnutls-c++-debuginfoUpgrade gnutls-dane-debuginfoUpgrade gnutls-develUpgrade gnutls-utilsUpgrade gnutlsUpgrade gnutls-debuginfoUpgrade gnutls-daneUpgrade gnutls-utils-debuginfoUpgrade gnutls-debugsource | May 28, 2026 | May 7, 2026 |
| Debian | — | Upgrade gnutls28 | May 20, 2026 | May 20, 2026 |
| Oracle_linux | — | Upgrade gnutlsUpgrade gnutls-utilsUpgrade gnutls-develUpgrade gnutls-c++Upgrade gnutls-dane | Jun 4, 2026 | May 7, 2026 |
| Redhat Openshift | — | Upgrade rhcos | Aug 10, 2026 | Apr 29, 2026 |
| Redhat_linux | — | Upgrade gnutls-utilsUpgrade gnutls-dane-debuginfoUpgrade gnutls-debugsourceUpgrade gnutls-utils-debuginfoUpgrade gnutls-c++Upgrade gnutls-develUpgrade gnutlsUpgrade gnutls-daneUpgrade gnutls-debuginfoUpgrade gnutls-c++-debuginfoUpgrade gnutls-fips | May 28, 2026 | Apr 29, 2026 |
| Rocky_linux | — | Upgrade gnutls-utils-debuginfoUpgrade gnutls-utilsUpgrade gnutls-daneUpgrade gnutls-debugsourceUpgrade gnutls-debuginfoUpgrade gnutls-c++Upgrade gnutls-develUpgrade gnutls-fipsUpgrade gnutlsUpgrade gnutls-dane-debuginfoUpgrade gnutls-c++-debuginfo | Jun 1, 2026 | May 29, 2026 |
| Ubuntu | — | Upgrade libgnutls-openssl27 (Ubuntu Pro)Upgrade libgnutlsxx28 (Ubuntu Pro)Upgrade gnutls-bin (Ubuntu Pro)Upgrade libgnutls30t64Upgrade libgnutls30Upgrade libgnutls30 (Ubuntu Pro)Upgrade libgnutls-dane0 (Ubuntu Pro)Upgrade libgnutls28-dev (Ubuntu Pro)Upgrade guile-gnutls (Ubuntu Pro) | May 25, 2026 | May 20, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 7, 2026 |
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