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CVE-2026-91150VulnerabilityPublished Updated

Cockpit. This vulnerability

Affects cockpitSource GCVE Database

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Authoritative record:CVE-2026-91150· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 13 Nov 2026, 21:53 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.17.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10cockpitpkg:deb/ubuntu/cockpit?arch=source&distro=stonkingOther threatsAffected
  • 360-1 – 367-1
4 affected builds
Fixed in–
Ubuntu 26.04 LTScockpitpkg:deb/ubuntu/cockpit?arch=source&distro=resoluteOther threatsAffected
  • 346-1 – 360-1
9 affected builds
Fixed in–
Ubuntu 24.04 LTScockpitpkg:deb/ubuntu/cockpit?arch=source&distro=nobleOther threatsAffected
  • 300.1-1 – 314-1
12 affected builds
Fixed in–
Ubuntu 22.04 LTScockpitpkg:deb/ubuntu/cockpit?arch=source&distro=jammyOther threatsAffected
  • 252-1 – 264-1ubuntu0.22.04.1
11 affected builds
Fixed in–
Ubuntu 20.04 LTScockpitpkg:deb/ubuntu/cockpit?arch=source&distro=focalOther threatsAffected
  • 202.1-1 – 215-1
11 affected builds
Fixed in–
Ubuntu 18.04 LTScockpitpkg:deb/ubuntu/cockpit?arch=source&distro=bionicOther threatsAffected
  • 151-1 – 164-1
9 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix for this vulnerability is available as indicated by the Red Hat advisory and Cockpit project commits. Users should upgrade to a fixed version of Cockpit to remediate this issue. No alternative mitigations are specified. Since the vulnerability is in a non-cloud service, patching the affected software versions is required to resolve the issue.

Description

A vulnerability in Cockpit's cockpit-ws service allows unauthenticated remote attackers to send specially crafted fragmented WebSocket messages that accumulate without size limits, causing unbounded memory exhaustion and denial of service. This flaw affects multiple specific Cockpit versions and has a high severity rating with a CVSS score of 7.5. The vulnerability is significant because cockpit-ws is commonly exposed for remote management on Red Hat Enterprise Linux systems.

References

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