DEBIAN-CVE-2026-84501
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-84501
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-84501.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-84501
- Upstream
- Published
- 2026-09-16T10:16:53Z
- Modified
- 2026-09-19T22:47:40Z
- 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
-
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.
- 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