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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 : upgrade Red Hat fence-agents to 9.6.13 soon.

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.
Patch
Available – fixed in 9.6.13

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

Upgrade Red Hat fence-agents to 9.6.13.

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • >=9.6 <9.6.13
Fixed in
  • 9.6.13

AI-suggested

Red Hat has released an updated fence-agents package for Red Hat Enterprise Linux 9.6 Extended Update Support that fixes this vulnerability. Users should apply the update as described in the Red Hat advisory (RHSA-2026:1332) and the referenced article (https://access.redhat.com/articles/11258) to remediate the issue. No additional mitigation steps are indicated by the vendor.

Description

A security update for the fence-agents package in Red Hat Enterprise Linux addresses a vulnerability in the urllib3 library (CVE-2025-66418) involving an unbounded decompression chain that can lead to resource exhaustion. The fence-agents package is used for remote power management in cluster environments to forcibly restart and remove failed or unreachable nodes. This vulnerability could allow an attacker to exhaust system resources through crafted decompression requests. The update is rated as Important by Red Hat Product Security and applies to Red Hat Enterprise Linux 9.6 Extended Update Support and related variants.

References

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