Red Hat Security Advisory: Red Hat OpenStack Platform 17.1 (python-h11) security update
Affects Red HatSource GCVE Database
Not known to be exploited.
Data as of 31 Oct 2026, 20:20 UTC
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
Disclosed: evidence found.
CVE published 14 May 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 an update for the python-h11 package in Red Hat OpenStack Platform 17.1 on RHEL 9 to address this vulnerability. Users should apply the security update as detailed in the Red Hat advisory (RHSA-2025:7536) and follow the instructions in the referenced article (https://access.redhat.com/articles/11258) to remediate the issue.
Description
A security vulnerability identified as CVE-2025-43859 affects the python-h11 package used in Red Hat OpenStack Platform 17.1. The issue involves the acceptance of some malformed Chunked-Encoding bodies by h11. Red Hat has issued an important security update addressing this vulnerability in the python-h11 package for Red Hat OpenStack Platform 17.1 on RHEL 9.