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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

Red Hat has released an update to ansible-core version 2.16.19 which includes the fix for this vulnerability. Users should apply this update after ensuring all previous errata are applied. No effective mitigations other than applying the update are currently available or meet Red Hat's criteria for ease of use and stability.

Description

CVE-2025-66418 is a denial of service vulnerability in the urllib3 Python library used by Red Hat Ansible Automation Platform. A malicious server can exploit this by sending an HTTP response with an excessive number of chained compression algorithms, causing unbounded decompression and resource exhaustion. This leads to high CPU and memory usage, 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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