Central Dogma: Hard-coded ZooKeeper replication secret 'ch4n63m3' with silent fallback enables cluster takeover — GHSA-2J95-GQXF-V3VG

Summary

## Vulnerability `ZooKeeperReplicationConfig.secret()` silently substitutes the hard-coded constant `"ch4n63m3"` (leetspeak for "change me") whenever the operator omits `replication.secret`. The same secret is wired into both the **client-facing SASL context** and the **quorum/learner SASL contexts** of the embedded ZooKeeper. The constant is in OSS source on GitHub and is discoverable via code search in seconds.…

Timeline

Published by source

2026-09-11

Risk context

• Reported severity or threat level: critical.
• Reported CVSS score: 9.4 out of 10.
• Reported EPSS value: 0.00229.
• Review exposure for the affected product or family: maven: com.linecorp.centraldogma:centraldogma-server.

Product

maven: com.linecorp.centraldogma:centraldogma-server

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-2J95-GQXF-V3VG

Source

GitHub

Vendor

GitHub

Published by source

2026-09-11

Last source activity

2026-09-11

Additional identifiers

CVE-2026-11746

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.