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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, 20:53 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 27 Jan 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 updated fence-agents packages for Red Hat Enterprise Linux 9.0 and related variants that fix this vulnerability. Users should apply these official updates as detailed in the Red Hat advisory (RHSA-2026:1329) to remediate the issue. No additional mitigation steps are indicated beyond applying the vendor-provided patches.

Description

A security update for the fence-agents packages in Red Hat Enterprise Linux addresses a vulnerability in urllib3 (CVE-2025-66418) that allows an unbounded decompression chain leading to resource exhaustion. The fence-agents scripts manage remote power control for cluster devices, enabling forced restart and removal of failed or unreachable nodes. This vulnerability could impact the stability of systems using these packages.

References

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