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CVE-2025-43859VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat OpenStack Platform 18.0 (python-h11) security 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 14 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 released a security update for python-h11 in Red Hat OpenStack Platform 18.0 to address this vulnerability. Users should apply the update as described in the Red Hat advisory (https://access.redhat.com/articles/11258) to remediate the issue. Since an official fix is available, applying the update is the recommended mitigation.

Description

A security vulnerability (CVE-2025-43859) affecting the python-h11 package in Red Hat OpenStack Platform 18.0 allows acceptance of some malformed Chunked-Encoding bodies. This issue has been rated as having an Important security impact by Red Hat Product Security. A security update is available to address this vulnerability.

References

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