---
id: CVE-2026-91149
title: A flaw was found in Cockpit
summary: >-
  A flaw was found in Cockpit. An unauthenticated remote attacker can exploit
  this vulnerability by initiating and sustaining numerous simultaneous
  connections to the `cockpit-tls` service. This forces the service to create an
  unbounded nu…
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-770
vendor: Red Hat
product: cockpit
affected:
  - cockpit (all versions)
  - cockpit (all versions)
  - cockpit (all versions)
  - cockpit (all versions)
  - devspaces/udi-base-rhel10 (all versions)
  - devspaces/udi-base-rhel9 (all versions)
  - devspaces/udi-rhel9 (all versions)
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:06:08.407'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91149'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-91149'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2479422'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-18T16:48:28.909025Z'
ingestedAt: '2026-09-18T16:45:41.404Z'
epss: 0.00608
epssPercentile: 0.46835
---

## Overview

A flaw was found in Cockpit. An unauthenticated remote attacker can exploit this vulnerability by initiating and sustaining numerous simultaneous connections to the `cockpit-tls` service. This forces the service to create an unbounded number of detached threads, consuming system resources such as memory and file descriptors. The primary consequence is a denial of service (DoS), leading to degradation or complete unavailability of the Cockpit service for legitimate users.

## Remediation

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