BIT-zookeeper-2026-84501
See a problem?- Import Source
- https://github.com/bitnami/vulndb/tree/main/data/zookeeper/BIT-zookeeper-2026-84501.json
- JSON Data
- https://api.osv.dev/v1/vulns/BIT-zookeeper-2026-84501
- Aliases
- Published
- 2026-09-19T08:51:30Z
- Modified
- 2026-09-19T09:15:03Z
- Summary
- Apache ZooKeeper: Operational log forgery via newline injection in EnsembleAuthenticationProvider
- Details
-
An unauthenticated attacker can inject arbitrary fake log lines into Apache ZooKeeper's operational log by sending a crafted add_auth("ensemble", ...) request containing newline characters (\n). When the ensemble name doesn't match, EnsembleAuthenticationProvider.handleAuthentication() logs the raw, unsanitized name via LOG.warn(). Because SLF4J's {} placeholder preserves embedded newlines, the attacker can forge complete log entries — with arbitrary timestamps, log levels, class names, and messages — that are visually indistinguishable from genuine ZooKeeper log output.
This issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6.
Users are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.
- Database specific
{ "cpes": [ "cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*" ], "severity": "Medium" }- References
Affected packages
Bitnami / zookeeper
Package
- Name
- zookeeper
- Purl
- pkg:bitnami/zookeeper
Severity
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator