CVE-2026-42010

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-07 12:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-04 23:17 UTC Last updatedMost recent change to the record

Details

Published

2026-05-07 12:16 UTC

Last modified

2026-11-04 23:17 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-170

Record status

Modified

Affected

• Gnu Gnutls
• Redhat Hardened Images
• Redhat Openshift Container Platform 4.0
• Redhat Enterprise Linux 6.0
• Redhat Enterprise Linux 7.0
• Redhat Enterprise Linux 8.0
• Redhat Enterprise Linux 9.0
• Redhat Enterprise Linux 10.0

Attack profile CVSS 3.1 · 7.1

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None