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CVE-2025-66418VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Ansible Automation Platform Execution Environments Update

Affects Red HatSource 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 · CVSS not yet scored by NVD

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 29 Sep 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

A fix is available by updating Red Hat Ansible Automation Platform Execution Environments to ansible-core version 2.16.19, which includes the patched urllib3 library. Users should apply this update after ensuring all previously released errata are applied. No alternative mitigations meeting Red Hat's criteria are currently available.

Description

A denial of service vulnerability exists in the urllib3 Python library used by Red Hat Ansible Automation Platform. A malicious server can exploit this flaw by sending an HTTP response with an excessive number of chained compression algorithms, causing unbounded decompression. This leads to excessive CPU and memory consumption, making the application unresponsive. Red Hat has released an update to ansible-core version 2.16.19 which includes fixes for this issue and dependency updates including urllib3.

References

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