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CVE Vulnerabilities

CVE-2026-42010

Improper Null Termination

Published: May 07, 2026 | Modified: Jun 17, 2026
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.1 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-42010
CWEhttps://cwe.mitre.org/data/definitions/170.html

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.

Weakness

The product does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator.

Affected Software

NameVendorStart VersionEnd Version
GnutlsGnu- (including)- (including)
Hardened_imagesRedhat- (including)- (including)
Openshift_container_platformRedhat4.0 (including)4.0 (including)
Enterprise_linuxRedhat6.0 (including)6.0 (including)
Enterprise_linuxRedhat7.0 (including)7.0 (including)
Enterprise_linuxRedhat8.0 (including)8.0 (including)
Enterprise_linuxRedhat9.0 (including)9.0 (including)
Enterprise_linuxRedhat10.0 (including)10.0 (including)
Red Hat Enterprise Linux 10RedHatgnutls-0:3.8.10-4.el10_2*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHatgnutls-0:3.8.9-9.el10_0.19*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.6*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.6*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.10-4.el9_8*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.10-4.el9_8*
Red Hat Hardened ImagesRedHatgnutls-main-3.8.13-1.hum1*
Red Hat Update Infrastructure 5RedHatrhui5/cds-rhel9:1781525684*
Red Hat Update Infrastructure 5RedHatrhui5/haproxy-rhel9:1781525671*
Red Hat Update Infrastructure 5RedHatrhui5/installer-rhel9:1781525693*
Red Hat Update Infrastructure 5RedHatrhui5/rhua-rhel9:1781525739*
Gnutls28Ubuntudevel*
Gnutls28Ubuntuesm-infra/xenial*
Gnutls28Ubuntufips-preview/jammy*
Gnutls28Ubuntufips-updates/jammy*
Gnutls28Ubuntufips-updates/noble*
Gnutls28Ubuntujammy*
Gnutls28Ubuntunoble*
Gnutls28Ubuntuquesting*
Gnutls28Ubunturesolute*
Gnutls28Ubuntuupstream*

Potential Mitigations

References

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