# CERT-FR Warns of Apache ZooKeeper Flaws

Published: 2026-11-04 · Severity: routine
Canonical: https://vorant.io/reports/b9dce620-ed47-593b-a557-e5ed35996ce9/cert-fr-warns-of-apache-zookeeper-flaws
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> CERT-FR advisory details multiple Apache ZooKeeper vulnerabilities allowing remote denial of service and security bypass; patch to 3.8.8 or 3.9.7.

Source: cert.cyber.gouv.fr — https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1448

## What to check

- Applies to: The 5 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation: No exploitation in the wild and no public exploit is recorded for the CVEs named.

CERT-FR has issued an advisory covering multiple vulnerabilities affecting Apache ZooKeeper, a widely used distributed coordination service for distributed applications. The affected versions are ZooKeeper 3.8.x prior to 3.8.8 and 3.9.x prior to 3.9.7. According to the advisory, successful exploitation of these flaws could allow an attacker to bypass security policy controls or cause a remote denial of service condition.

Five CVEs are referenced in the bulletin (CVE-2026-100235, CVE-2026-100252, CVE-2026-100300, CVE-2026-100302, and CVE-2026-115448), though the advisory does not provide technical details on each individual flaw. No in-the-wild exploitation is mentioned in the advisory. Defenders should consult the Apache ZooKeeper security bulletin dated 04 November 2026 for patch details and apply the vendor-provided fixes.

Organizations running ZooKeeper clusters — commonly deployed to support Kafka, Hadoop, Solr, and other distributed systems — should prioritize upgrading to version 3.8.8 or 3.9.7 to mitigate the denial-of-service and security-bypass risks described.

## Mentioned in this report

- Vulnerabilities: CVE-2026-100235, CVE-2026-100252, CVE-2026-100300, CVE-2026-100302, CVE-2026-115448

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1448

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