CVE catalog

CVE-2026-24281

Severity: High · CVSS 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Mar 7, 2026, 8:50:32 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.65% · Oct 25, 2026

Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.

Vulnerable and fixed packages

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

Distribution	Package	Release	Version	Status
Debian	zookeeper	sid	`3.9.6-2`	fixed
Debian	zookeeper	forky	`3.9.6-2`	fixed
Debian	zookeeper	trixie	`3.9.3-1+deb13u1`	vulnerable
Debian	zookeeper	bookworm	`3.8.0-11+deb12u2`	vulnerable
Debian	zookeeper	bookworm-security	`3.8.0-11+deb12u1`	vulnerable
Cpe	zookeeper	Not reported	Not reported	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	zookeeper	source	sid	`3.9.5-1`	not yet assigned	Not reported	[1130496]
Debian	zookeeper	source	forky	`3.9.5-1`	not yet assigned	Not reported	[1130496]
Debian	zookeeper	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1130496]
Debian	zookeeper	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1130496]

[Debian bug #1130496]

Notes

[trixie] zookeeper: Minor issue [bookworm] zookeeper: Minor issue

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: Oct 24, 2026, 12:37:34 AM UTC

References

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