CVE catalog

CVE-2026-84439

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 t

[CVE catalog]

Severity
Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.74% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianzookeepersid3.9.6-2fixed
Debianzookeeperforky3.9.6-2fixed
Debianzookeepertrixie3.9.3-1+deb13u1vulnerable
Debianzookeeperbookworm3.8.0-11+deb12u2vulnerable
Debianzookeeperbookworm-security3.8.0-11+deb12u1vulnerable
CpezookeeperNot reported3.9.6fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianzookeepersourcesid3.9.6-1not yet assignedNot reported[1148409]
Debianzookeepersourceforky3.9.6-1not yet assignedNot reported[1148409]
Debianzookeepersourcetrixie(unfixed)not yet assignedNot reported[1148409]
Debianzookeepersourcebookworm(unfixed)not yet assignedNot reported[1148409]
CpezookeepercpeNot reported3.9.6Not reportedNVD-CVE-2026-84439Not reported

[Debian bug #1148409]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [libzookeeper-java]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [libzookeeper-java-doc]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [libzookeeper-mt2]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · amd64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · arm64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · amd64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · arm64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [libzookeeper-mt-dev]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · amd64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · arm64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · amd64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · arm64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [libzookeeper-st2]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · amd64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · arm64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · amd64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · arm64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [libzookeeper-st-dev]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · amd64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · arm64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · amd64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · arm64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [python3-zookeeper]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · amd64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · arm64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · amd64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · arm64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [zookeeper]Affected
    Details (4)

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [zookeeper-bin]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · amd64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · arm64 · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · amd64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · arm64 · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

  • [zookeeperd]Affected

    Source package: [zookeeper]

    Details (4)

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u2 · all · bookworm

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

    • 3.8.0-11+deb12u1 · all · bookworm-security

      Affected

      nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

[Debian 13 (Trixie)]

  • [libzookeeper-java]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [libzookeeper-java-doc]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [libzookeeper-mt2]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · amd64 · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · arm64 · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [libzookeeper-mt-dev]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · amd64 · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · arm64 · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [libzookeeper-st2]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · amd64 · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · arm64 · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [libzookeeper-st-dev]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · amd64 · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · arm64 · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [python3-zookeeper]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · amd64 · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · arm64 · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [zookeeper]Affected
    Details (2)

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [zookeeper-bin]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · amd64 · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · arm64 · trixie

      Affected

      nvd · zookeeper · debian · 13

  • [zookeeperd]Affected

    Source package: [zookeeper]

    Details (2)

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

    • 3.9.3-1+deb13u1 · all · trixie

      Affected

      nvd · zookeeper · debian · 13

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]