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CVE-2026-91150VulnerabilityPublished

Red Hat Security Advisory: cockpit security update

Affects Red Hat cockpitSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-91150· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 12 Nov 2026, 14:35 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 12 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10cockpitAffected–Fixed in–
Red Hat Enterprise Linux 8cockpitAffected–Fixed in–
Red Hat Enterprise Linux 9cockpitAffected–Fixed in–
Red Hat Enterprise Linux 9.8 Extended Update SupportcockpitAffected–Fixed in–
Red Hat Enterprise Linux 7cockpitAffected–Fixed in–
Red Hat OpenShift Dev Spacesdevspaces/udi-base-rhel10Affected–Fixed in–

AI-suggested

Red Hat has released updated Cockpit packages for Red Hat Enterprise Linux 9.8 Extended Update Support that address these vulnerabilities. Users should apply the provided security updates promptly to remediate the issues. Detailed update instructions are available in the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are indicated beyond applying the official patches.

Description

Two security vulnerabilities affecting the Cockpit web-based server administration tool in Red Hat Enterprise Linux 9.8 Extended Update Support have been addressed. One vulnerability (CVE-2026-91151) allows local privilege escalation due to insecure symbolic link handling in the public key addition helper. The other (CVE-2026-91150) is a denial of service caused by unbounded fragmented WebSocket messages. Red Hat has released updates to fix these issues in the Cockpit packages for multiple architectures.

References

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