---
id: CVE-2026-76235
title: >-
  Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via
  cockpitlang cookie in send_login_html
summary: >-
  A memory leak flaw was found in cockpit-ws. The login page handler leaks a
  heap allocation on every unauthenticated request that carries a CockpitLang
  cookie, allowing a remote unauthenticated attacker to exhaust memory on the
  host and c…
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'
cvssSource: cna
cwe:
  - CWE-401
vendor: Red Hat
product: cockpit
affected:
  - cockpit (all versions)
  - cockpit (all versions)
  - cockpit (all versions)
  - cockpit (all versions)
  - cockpit (all versions)
  - devspaces/udi-base-rhel10
  - devspaces/udi-base-rhel9
  - devspaces/udi-rhel9
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-08-25T01:50:16.317408Z'
published: '2026-08-19'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T00:44:04.196Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-76235'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:94485'
    label: 'RHSA-2026:94485'
  - url: 'https://access.redhat.com/errata/RHSA-2026:94533'
    label: 'RHSA-2026:94533'
  - url: 'https://access.redhat.com/security/cve/CVE-2026-76235'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2519497'
    label: RHBZ#2519497
tags:
  - cve.org
epss: 0.00585
epssPercentile: 0.48142
ingestedAt: '2026-11-05T20:33:06.640Z'
---

## Overview

A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to exhaust memory on the host and cause a denial of service.

## Affected

- `cockpit (all versions)`
- `cockpit (all versions)`
- `cockpit (all versions)`
- `cockpit (all versions)`
- `cockpit (all versions)`
- `devspaces/udi-base-rhel10`
- `devspaces/udi-base-rhel9`
- `devspaces/udi-rhel9`

## Remediation

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

### Workarounds

Restrict network access to the cockpit port to trusted clients until a fix is available. No configuration-level mitigation removes the flaw entirely, since the login page must remain reachable without authentication.