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CVE-2025-43859VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Container Release Update

Affects Red HatSource GCVE Database

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Not known to be exploited.

Data as of 31 Oct 2026, 20:20 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.5% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 May 2025

  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 31 Oct 2026.

What to do

AI-suggested

Red Hat has provided official fixes for this vulnerability in updated versions of the Ansible Automation Platform 2.5 containers and collections. Users should apply the updates to Ansible Lightspeed (version 2.5.250528) and related collections (ansible.controller 4.6.13, ansible.platform 2.5.20250528) as provided in the Red Hat advisory RHSA-2025:8221. Applying these updates will remediate the vulnerability.

Description

Red Hat Ansible Automation Platform 2.5 contains a security vulnerability identified as CVE-2025-43859, where the h11 HTTP library accepts some malformed Chunked-Encoding bodies. This issue affects several container components of the platform, including ansible-lightspeed-container and related chatbot and cloud services containers. Red Hat has released updates to address this vulnerability by updating Ansible Lightspeed and related collections to fixed versions.

References

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