RHSA-2026:94523 — Security Advisory

Red Hat Security Advisory: fence-agents security update

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Severity

Critical

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · November 3, 2026

Updated · November 5, 2026

Topic

An update for fence-agents is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Critical. 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

The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

Security Fix(es):

pyjwt: pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)
pyjwt: PyJWT: Authentication bypass via improper public key validation (CVE-2026-102268)
pyjwt: PyJWT: Authentication bypass via acceptance of DER public keys as HMAC secrets (CVE-2026-102271)
pyjwt: pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)
pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)

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