Vulnerability CVE-2026-42010: Information
Description
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.
Severity: CRITICAL (9.8)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| gnutls30 | sisyphus | 3.8.13-alt1 | 3.8.13-alt1 | ALT-PU-2026-7123-1 | 417120 | Fixed |
| gnutls30 | sisyphus_e2k | 3.8.13-alt1 | 3.8.13-alt1 | ALT-PU-2026-7620-1 | - | Fixed |
| gnutls30 | sisyphus_riscv64 | 3.8.13-alt1 | 3.8.13-alt1 | ALT-PU-2026-7535-1 | - | Fixed |
| gnutls30 | sisyphus_loongarch64 | 3.8.13-alt1 | 3.8.13-alt1 | ALT-PU-2026-7498-1 | - | Fixed |
| gnutls30 | p11 | 3.8.13-alt1 | 3.8.13-alt1 | ALT-PU-2026-7127-2 | 417121 | Fixed |
| gnutls30 | p10 | 3.6.16-alt11 | 3.6.16-alt11 | ALT-PU-2026-7344-2 | 417556 | Fixed |
| gnutls30 | p10_e2k | 3.6.16-alt11 | 3.6.16-alt11 | ALT-PU-2026-7867-1 | - | Fixed |
| gnutls30 | c10f2 | 3.6.16-alt11 | 3.6.16-alt11 | ALT-PU-2026-7348-2 | 417557 | Fixed |
References to Advisories, Solutions, and Tools
Hyperlink | Resource |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:13274 | |
| https://access.redhat.com/security/cve/CVE-2026-42010 |
|
| https://bugzilla.redhat.com/show_bug.cgi?id=2467289 |
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