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CVE-2025-66418VulnerabilityPublished Updated

Red Hat Security Advisory: fence-agents security update

Affects Red Hat fence-agentsSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 20:36 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.6% chance of exploitation in 30 days – higher than 52% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Feb 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 30 Oct 2026.

What to do

AI-suggested

Red Hat has released an official security update for fence-agents in Red Hat Enterprise Linux 8.6 that addresses CVE-2025-66418. Users should apply this update promptly to remediate the vulnerability. For detailed instructions on applying the update, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor.

Description

The fence-agents packages in Red Hat Enterprise Linux provide scripts for remote power management of cluster devices, allowing failed or unreachable nodes to be forcibly restarted and removed from the cluster. A security vulnerability (CVE-2025-66418) in urllib3 used by these packages involves an unbounded decompression chain that can lead to resource exhaustion. This vulnerability has been addressed in an update for Red Hat Enterprise Linux 8.6. The update is rated as having an important security impact by Red Hat Product Security.

References

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