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CVE-2026-59969— Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode

Quick assessment

Affected
Apache Software Foundation Apache ZooKeeper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 SSLSocke

AI Predicted 6.5 Difficulty: Moderate
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I. Basic Information for CVE-2026-59969

Vulnerability Information

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Vulnerability Title
Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache ZooKeeper 3.9.0 ~ 3.9.5 -

II. Public POCs for CVE-2026-59969

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III. Intelligence Information for CVE-2026-59969

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Mailing List Discussions for CVE-2026-59969 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-16 · 13 CVEs total

CVE-2026-84501 Apache ZooKeeper: Operational log forgery via newline injection in EnsembleAuthenticationP
CVE-2026-84439 Apache ZooKeeper: Audit log injection via unsanitized output from multiple sources
CVE-2026-79993 Apache ZooKeeper: Missing ACL check on deleteContainer opcode allows unauthorized deletion
CVE-2026-59739 Apache ZooKeeper: Information disclosure via SetWatches reconnect replay
CVE-2026-86466 Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validate
CVE-2026-76187 Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session J
CVE-2026-76186 Apache Airflow Keycloak provider: Keycloak token cookies not bound to Airflow session iden
CVE-2026-82310 Apache Airflow FAB provider: FAB auth manager: deactivated users retain and renew Core API
CVE-2026-86792 Apache Airflow Apache Kafka provider: Connection-editor remote code execution on the Sched
CVE-2026-86462 Apache Airflow FAB provider: FAB Admin password PATCH does not invalidate database-backed
CVE-2026-82311 Apache Airflow FAB provider: FAB password reset never invalidates sessions: string/int _us
CVE-2026-86465 Apache Airflow Akeyless provider: Akeyless secrets backend: team-scope guard bypass via us

IV. Related Vulnerabilities

Same product: Apache ZooKeeper
Same vendor: Apache Software Foundation
Same weakness: CWE-297

V. Comments for CVE-2026-59969

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