| Name | CVE-2026-59969 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| zookeeper (PTS) | bookworm | 3.8.0-11+deb12u2 | vulnerable |
| bookworm (security) | 3.8.0-11+deb12u1 | vulnerable | |
| trixie | 3.9.3-1+deb13u1 | vulnerable | |
| forky, sid | 3.9.6-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| zookeeper | source | (unstable) | 3.9.6-1 |
https://lists.apache.org/thread/qf9kwsgtgbgtvwls6f41281846xg0rss