---
id: CVE-2026-1584
title: A flaw was found in gnutls
summary: >-
  A flaw was found in gnutls. A remote, unauthenticated attacker can exploit
  this vulnerability by sending a specially crafted ClientHello message with an
  invalid Pre-Shared Key (PSK) binder value during the TLS handshake. This can
  lead to…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
  - CWE-476
vendor: gnu
product: gnutls
affected:
  - gnutls
  - hardened_images
published: '2026-04-09'
updated: '2026-08-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-1584'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:7477'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-1584'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2435258'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:7477'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-1584'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2435258'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.01323
epssPercentile: 0.69662
ingestedAt: '2026-08-21T20:21:42.522Z'
---

## Overview

A flaw was found in gnutls. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted ClientHello message with an invalid Pre-Shared Key (PSK) binder value during the TLS handshake. This can lead to a NULL pointer dereference, causing the server to crash and resulting in a remote Denial of Service (DoS) condition.

## Affected

- `gnutls`
- `hardened_images`

## Remediation

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