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CVE-2026-42010

critical

A flaw was found in gnutls.

Vendor / product: Gnu — gnutls

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
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-05-07 12:16
Modified: 2026-10-26 22:10
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

gnu / gnutls all versions
redhat / hardened_images all versions
redhat / openshift_container_platform 4.0
redhat / enterprise_linux 6.0, 7.0, 8.0, 9.0, 10.0

Weakness classification (CWE)

CWE-170 CWE-626

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-42010
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2467289
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-42010
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2467289

References

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗

Learn the basics

Understanding CVEs and CVSS Scores

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