---
id: CVE-2026-5260
title: A flaw was found in libgnutls
summary: >-
  A flaw was found in libgnutls. A remote attacker, by sending an extremely
  short premaster secret during an RSA key exchange to a server using an RSA key
  backed by a PKCS#11 token, could trigger a short heap overread. This memory
  corrupti…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-126
vendor: Red Hat
product: gnutls
affected:
  - gnutls all versions
  - gnutls (all versions)
  - gnutls (all versions)
  - gnutls (all versions)
  - gnutls (all versions)
  - gnutls (all versions)
  - libtasn1 (all versions)
  - gnutls (all versions)
  - libtasn1 (all versions)
  - gnutls (all versions)
  - libtasn1 (all versions)
  - gnutls (all versions)
  - libtasn1 (all versions)
  - gnutls (all versions)
  - libtasn1 (all versions)
  - gnutls (all versions)
  - libtasn1 (all versions)
  - gnutls (all versions)
  - gnutls (all versions)
  - gnutls (all versions)
  - gnutls (all versions)
  - gnutls (all versions)
  - rhcos (all versions)
  - rhcos (all versions)
  - rhcos (all versions)
  - rhcos (all versions)
  - rhcos (all versions)
  - rhcos (all versions)
  - discovery/discovery-server-rhel9 (all versions)
  - discovery/discovery-ui-rhel9 (all versions)
  - gnutls-main (all versions)
  - rhui5/cds-rhel9 (all versions)
  - rhui5/haproxy-rhel9 (all versions)
  - rhui5/installer-rhel9 (all versions)
  - rhui5/rhua-rhel9 (all versions)
  - rhui5/cds-kubernetes-tp-rhel9 (all versions)
  - rhui5/installer-tp-rhel9 (all versions)
  - rhui5/rhua-tp-rhel9 (all versions)
  - gnutls
  - gnutls
  - openshift/ose-rhel-coreos-8 (all versions)
  - openshift/ose-rhel-coreos-9 (all versions)
published: '2026-05-26'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T12:17:12.440'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5260'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:13274'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:20611'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:20612'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:20613'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:26319'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:26409'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:29197'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:30004'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:30849'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:30850'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:32962'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:33125'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:40762'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:41921'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:56853'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:57483'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:58981'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:59831'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60019'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:67837'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-5260'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467450'
    label: secalert@redhat.com
  - url: 'https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
epss: 0.00727
epssPercentile: 0.52743
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-05-27T13:36:46.793551Z'
ingestedAt: '2026-06-29T13:42:11.964Z'
---

## Overview

A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.