RHSA-2026:28042 - Security Advisory

Topic

An update for python-pyasn1 is now available for Red Hat OpenStack Platform
17.1 (Wallaby).

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.

Description

This is an implementation of ASN.1 types and codecs in the Python
programming language.

Security Fix(es):

• pyasn1: Denial of Service due to memory exhaustion from malformed

RELATIVE-OID (CVE-2026-23490)

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.

Solution

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat OpenStack 17.1 for RHEL 8 x86_64
• Red Hat OpenStack Director Deployment Tools 17.1 for RHEL 8 x86_64

Fixes

• BZ - 2430472 - CVE-2026-23490 pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID

CVEs

• CVE-2026-23490

References

• https://access.redhat.com/security/updates/classification/#important