CVE-2026-42010CRITICAL 7.1EPSS p53.8%

CVE-2026-42010CVE-2026-42010

gnu / gnutls

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.

Scoring

CVSS 3.17.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
EPSS0.86% probability of exploitation · percentile 53.8% · 2026-06-19T12:03:05Z
Published2026-05-07
Last modified2026-06-10

Underlying weaknesses· 1

CWE-626

References

  1. https://access.redhat.com/errata/RHSA-2026:13274
  2. https://access.redhat.com/errata/RHSA-2026:20611
  3. https://access.redhat.com/security/cve/CVE-2026-42010
  4. https://bugzilla.redhat.com/show_bug.cgi?id=2467289

1

TypeTargetConfidenceTier
WeaknessNull Byte Interaction Error (Poison Null Byte)cwe-6260%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.