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  4. CVE 2026 91149 cockpit cockpit denial of service via unbounded
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Back to active CVEs
High · CVSS 7.5CVE-2026-91149

Cockpit: cockpit: denial of service via unbounded connection thread spawningCVE-2026-91149

Answer in brief

CVE-2026-91149 records a High severity (CVSS 7.5) vulnerability in Cockpit: cockpit: denial of service via unbounded connection thread spawning. 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). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Sep 18, 2026Updated Oct 16, 2026Source checked Nov 2, 2026First seen by HOL Sep 18, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
3 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). 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

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. Source-reported workaround: Restrict network access to the Cockpit listener (TCP port 9090) to trusted management networks or localhost only, using host firewall rules such as firewalld zones or iptables rules that limit which sources may reach port 9090. If remote access to the Cockpit web console is not required, disable the listener entirely with `systemctl disable --now cockpit.socket`. External connection-rate or concurrency limits in front of TCP port 9090, such as those enforced by a firewall or reverse proxy, further reduce exploitability. Lowering the service's task or file-descriptor ceilings can reduce the blast radius, but does not correct the missing concurrency bound in the cockpit-tls accept path; fixes are being pursued for the affected product streams.

Evidence timeline and material changes

  1. Published upstream

    Sep 18, 2026

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

  2. Source modified

    Oct 16, 2026

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

  3. First seen by HOL

    Sep 18, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • NetX Secure DTLS server allocates a session for each new source before the cookie exchange and never reclaims it, so spoofed datagrams exhaust the session poolAlso CWE-770

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 2, 2026
References
2 linked sources
Open source record