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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Red Hat Red Hat Enterprise Linux 10 affected —
Red Hat Red Hat Enterprise Linux 6 affected —
Red Hat Red Hat Enterprise Linux 7 affected —
Red Hat Red Hat Enterprise Linux 8 affected —
Red Hat Red Hat Enterprise Linux 9 affected —
Red Hat Red Hat Hardened Images affected —
Red Hat Red Hat OpenShift Container Platform 4 affected —

No data.

No data.

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Project Subscriptions

Vendors Products
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Enterprise Linux Subscribe
Hummingbird Subscribe
Openshift Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://access.redhat.com/security/cve/CVE-2026-42010 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2467289 cve-icon cve-icon
History

Thu, 07 May 2026 15:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Thu, 07 May 2026 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Thu, 07 May 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-626
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 07 May 2026 12:15:00 +0000

Type Values Removed Values Added
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.
Title Gnutls: gnutls: authentication bypass via nul character in username
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
CPEs cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-05-07T13:47:17.179Z

Reserved: 2026-04-23T11:23:46.517Z

Link: CVE-2026-42010

cve-icon Vulnrichment

Updated: 2026-05-07T13:46:44.564Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-07T12:16:17.977

Modified: 2026-05-07T15:16:09.640

Link: CVE-2026-42010

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-07T18:00:12Z

Weaknesses