RHEL 10 : gnutls (RHSA-2026:26409)

critical Nessus Plugin ID 321270

Synopsis

The remote Red Hat host is missing one or more security updates for gnutls.

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:26409 advisory.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Security Fix(es):

* gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response (CVE-2026-3832)

* gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison (CVE-2026-3833)

* gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment (CVE-2026-33845)

* gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly (CVE-2026-33846)

* gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)

* gnutls: gnutls: Authentication Bypass via NUL Character in Username (CVE-2026-42010)

* gnutls: gnutls: Security bypass due to incorrect name constraint handling (CVE-2026-42011)

* gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs (CVE-2026-42012)

* gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name (CVE-2026-42013)

* gnutls: gnutls: Information disclosure via heap overread in RSA key exchange (CVE-2026-5260)

* gnutls: Fix use-after-free in gnutls_pkcs11_token_set_pin (CVE-2026-42014)

* gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling (CVE-2026-42015)

* guntls: gnutls: Information disclosure via timing side-channel in PKCS#7 padding removal (CVE-2026-5419)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL gnutls package based on the guidance in RHSA-2026:26409.

Plugin Details

Severity: Critical

ID: 321270

File Name: redhat-RHSA-2026-26409.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 6/16/2026

Updated: 6/16/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-42010

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:gnutls-dane, p-cpe:/a:redhat:enterprise_linux:gnutls, p-cpe:/a:redhat:enterprise_linux:gnutls-fips, p-cpe:/a:redhat:enterprise_linux:gnutls-c%2b%2b, cpe:/o:redhat:enterprise_linux_eus:10.0, p-cpe:/a:redhat:enterprise_linux:gnutls-utils, p-cpe:/a:redhat:enterprise_linux:gnutls-devel, cpe:/o:redhat:enterprise_linux:10

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/16/2026

Vulnerability Publication Date: 4/30/2026

Reference Information

CVE: CVE-2026-33845, CVE-2026-33846, CVE-2026-3832, CVE-2026-3833, CVE-2026-42009, CVE-2026-42010, CVE-2026-42011, CVE-2026-42012, CVE-2026-42013, CVE-2026-42014, CVE-2026-42015, CVE-2026-5260, CVE-2026-5419

CWE: 1284, 130, 170, 178, 179, 191, 193, 208, 295, 475, 825

RHSA: 2026:26409

Detections

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