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  4. CVE 2026 91150 cockpit cockpit denial of service via unbounded
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Back to active CVEs
High · CVSS 7.5CVE-2026-91150

Cockpit: cockpit: denial of service via unbounded fragmented websocket messagesCVE-2026-91150

Answer in brief

CVE-2026-91150 records a High severity (CVSS 7.5) vulnerability in Cockpit: cockpit: denial of service via unbounded fragmented websocket messages. The current sources do not mark it as known exploited. The current feed maps Red Hat/cockpit (generic), Red Hat/devspaces/udi-base-rhel10 (generic), Red Hat/devspaces/udi-base-rhel9 (generic), Red Hat/devspaces/udi-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 11, 2026Updated Nov 11, 2026Source checked Nov 11, 2026First seen by HOL Nov 11, 2026Material review Nov 11, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/cockpit (generic), Red Hat/devspaces/udi-base-rhel10 (generic), Red Hat/devspaces/udi-base-rhel9 (generic), Red Hat/devspaces/udi-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/cockpitgeneric*Not reported
Red Hat/devspaces/udi-base-rhel10generic*Not reported
Red Hat/devspaces/udi-base-rhel9generic*Not reported
Red Hat/devspaces/udi-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/cockpit, Red Hat/devspaces/udi-base-rhel10, Red Hat/devspaces/udi-base-rhel9.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 11, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

A flaw was found in Cockpit. This vulnerability allows a remote attacker, without prior authentication, to send specially crafted fragmented WebSocket messages. These messages accumulate without a total-size limit, leading to unbounded memory exhaustion and a denial of service in the `cockpit-ws` service.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Uncontrolled resource consumption via post_noticeAlso CWE-770
  • Probo: GraphQL Alias-Based Application Layer Denial of Service (DoS)Also CWE-770

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 11, 2026
References
4 linked sources
Open source record