Bug 2542323 - CVE-2026-59969 golang-github-zookeeper-zk: Apache ZooKeeper: Improper certificate validation in FIPS mode allows quorum compromise [fedora-all]
Summary: CVE-2026-59969 golang-github-zookeeper-zk: Apache ZooKeeper: Improper certifi...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: golang-github-zookeeper-zk
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Alejandro Sáez Morollón
QA Contact:
URL:
Whiteboard: {"flaws": ["d8b776a0-87b7-4717-87f6-3...
Depends On:
Blocks: CVE-2026-59969
TreeView+ depends on / blocked
 
Reported: 2026-09-28 06:28 UTC by nlevinki
Modified: 2026-09-28 06:28 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:

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Description nlevinki 2026-09-28 06:28:32 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Apache ZooKeeper quorum TLS fails to enforce peer hostname verification in FIPS-mode deployments. When sslQuorum=true, zookeeper.fips-mode=true, ssl.quorum.hostnameVerification=true, and ssl.quorum.clientHostnameVerification=true are enabled, the Java SSLSocket quorum path accepts a CA-trusted peer certificate whose SAN does not match the connected host. A malicious or misissued peer certificate can therefore join quorum traffic, participate in leader election, and enter replication flows.



Users are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.
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