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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, 20:52 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

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • =9.4
Fixed in–

AI-suggested

Red Hat has released updated fence-agents packages for Red Hat Enterprise Linux 9.4 Extended Update Support that address CVE-2025-66418. Users should apply these official security updates as described in the Red Hat advisory (RHSA-2026:1331) and the referenced article (https://access.redhat.com/articles/11258) to remediate the vulnerability. No additional mitigation steps are indicated beyond applying the vendor-provided update.

Description

A security vulnerability (CVE-2025-66418) affecting the fence-agents packages in Red Hat Enterprise Linux 9.4 Extended Update Support has been addressed. The issue involves an unbounded decompression chain in urllib3 that can lead to resource exhaustion. Fence-agents are scripts used for remote power management in clusters to forcibly restart and remove failed or unreachable nodes. Red Hat has released an important security update to fix this vulnerability.

References

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