Authentication Bypass Vulnerability in GnuTLS Affects Remote Access Security
CVE-2026-42010

7.1HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
7 May 2026

What is CVE-2026-42010?

A flaw in GnuTLS allows for an authentication bypass due to improper handling of usernames by servers configured with RSA-PSK. When a username containing a NUL character is submitted, it falsely aligns with truncated usernames, enabling remote attackers to exploit this vulnerability. This manipulation can lead to unauthorized access, allowing attackers to circumvent the authentication process and gain privileges without valid credentials.

References

https://access.redhat.com/security/cve/CVE-2026-42010
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2467289
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Joshua Rogers (AISLE Research Team) for reporting this issue.
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