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CVE-2025-66418VulnerabilityPublished Updated

Red Hat Security Advisory: resource-agents security update

Affects Red Hat resource-agentsSource GCVE Database

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Not known to be exploited · fixed in Red Hat package updates : patch Red Hat resource-agents soon.

Data as of 30 Oct 2026, 20:37 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 4.9.0

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 resource-agents packages (version 4.9.0-16.el8_6.18) that address this vulnerability. Users should apply these official updates to affected Red Hat Enterprise Linux 8.6 systems as detailed in Red Hat advisory RHSA-2026:1340. No additional mitigation steps are indicated beyond applying the provided patches.

Description

A security vulnerability (CVE-2025-66418) affecting the resource-agents packages used by Pacemaker and RGManager service managers in Red Hat Enterprise Linux 8.6 has been addressed. The flaw involves an unbounded decompression chain in urllib3 that can lead to resource exhaustion. This vulnerability impacts high-availability environments relying on these service managers. Red Hat has issued an important security update to fix this issue.

References

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