DEBIAN-CVE-2026-84439
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-84439
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-84439.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-84439
- Upstream
- Published
- 2026-09-16T10:16:53Z
- Modified
- 2026-09-19T22:47:36Z
- 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
- Summary
- [none]
- Details
-
When audit logging is enabled (zookeeper.audit.enable=true), an unauthenticated attacker can inject arbitrary fields into Apache ZooKeeper's audit log by sending a digest authentication request with tab characters (\t) embedded in the username. Because the audit log uses tab-separated key=value format, the injected tabs are parsed as legitimate field separators, allowing the attacker to spoof audit results (e.g., injecting result=success), forge operation types, and corrupt forensic evidence. A log injection vulnerability in Apache ZooKeeper allows a client that can call setACL to inject forged key-value fields into zookeeper_audit.log. When audit logging is enabled, the server serializes attacker-controlled digest ACL ids into the acl= audit field without escaping tab characters. Because audit events are emitted as tab-separated key=value records, a crafted ACL id can make one successful setAcl event appear to contain forged fields such as operation=delete and znode=/forged. This undermines the integrity of downstream audit parsing, alerting, and incident response. 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 3.9.6 or 3.8.7, which fixes the issue.
- References
Affected packages
Debian:12 / zookeeper
Package
- Name
- zookeeper
- Purl
- pkg:deb/debian/zookeeper?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / zookeeper
Package
- Name
- zookeeper
- Purl
- pkg:deb/debian/zookeeper?arch=source&distro=trixie
Debian:14 / zookeeper
Package
- Name
- zookeeper
- Purl
- pkg:deb/debian/zookeeper?arch=source&distro=forky