RHSA-2026:39809 - Security Advisory

Topic

An update for erlang is now available for Red Hat OpenStack Services on
OpenShift 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.

Description

Erlang is a general-purpose programming language and runtime environment.
Erlang has built-in support for concurrency, distribution and fault
tolerance. Erlang is used in several large telecommunication systems from
Ericsson.

Security Fix(es):

• Erlang OTP public_key: Certificate chain forgery via improper trust chain

validation (CVE-2026-42789)

• Erlang OTP public_key: Certificate validation bypass allows hostname

spoofing (CVE-2026-42790)

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 Services on OpenShift 18.0 x86_64

Fixes

• BZ - 2482093 - CVE-2026-42789 erlang: Erlang OTP public_key: Certificate chain forgery via improper trust chain validation
• BZ - 2482286 - CVE-2026-42790 erlang: Erlang OTP public_key: Certificate validation bypass allows hostname spoofing

CVEs

• CVE-2026-42789
• CVE-2026-42790

References

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