An update for python-h11 is now available for Red Hat OpenStack Platform
18.0 (Antelope).

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

Security Fix(es):

* h11 accepts some malformed Chunked-Encoding bodies (CVE-2025-43859)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page listed in the References section.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2025-43859: Inconsistent Interpretation of HTTP Requests ('HTTP
 Request/Response Smuggling') (CWE-444)