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DEBIAN-CVE-2026-24281

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-24281

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-24281

zookeeper

Source reference: /affected/0/package/name

Affected versions
3.8.0-11

Source reference: /affected/0/versions

3.8.0-11+deb12u1

Source reference: /affected/0/versions

3.8.0-11+deb12u2

Source reference: /affected/0/versions

3.9.1-1

Source reference: /affected/0/versions

3.9.2-1

Source reference: /affected/0/versions

3.9.2-2

Source reference: /affected/0/versions

3.9.3-1

Source reference: /affected/0/versions

3.9.3-2

Source reference: /affected/0/versions

3.9.4-1

Source reference: /affected/0/versions

3.9.4-2

Source reference: /affected/0/versions

3.9.5-1

Source reference: /affected/0/versions

3.9.5-2

Source reference: /affected/0/versions

3.9.6-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

zookeeper

Source reference: /affected/1/package/name

Affected versions
3.9.3-1

Source reference: /affected/1/versions

3.9.3-1+deb13u1

Source reference: /affected/1/versions

3.9.3-2

Source reference: /affected/1/versions

3.9.4-1

Source reference: /affected/1/versions

3.9.4-2

Source reference: /affected/1/versions

3.9.5-1

Source reference: /affected/1/versions

3.9.5-2

Source reference: /affected/1/versions

3.9.6-1

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

zookeeper

Source reference: /affected/2/package/name

Affected versions
3.9.3-1

Source reference: /affected/2/versions

3.9.3-2

Source reference: /affected/2/versions

3.9.4-1

Source reference: /affected/2/versions

3.9.4-2

Source reference: /affected/2/versions

Fixed versions
3.9.5-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "zookeeper",
      "purl": "pkg:deb/debian/zookeeper?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.8.0-11",
      "3.8.0-11+deb12u1",
      "3.8.0-11+deb12u2",
      "3.9.1-1",
      "3.9.2-1",
      "3.9.2-2",
      "3.9.3-1",
      "3.9.3-2",
      "3.9.4-1",
      "3.9.4-2",
      "3.9.5-1",
      "3.9.5-2",
      "3.9.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-24281.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "zookeeper",
      "purl": "pkg:deb/debian/zookeeper?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.9.3-1",
      "3.9.3-1+deb13u1",
      "3.9.3-2",
      "3.9.4-1",
      "3.9.4-2",
      "3.9.5-1",
      "3.9.5-2",
      "3.9.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-24281.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.9.5-1"
          }
        ]
      }
    ],
    "package": {
      "name": "zookeeper",
      "purl": "pkg:deb/debian/zookeeper?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.9.3-1",
      "3.9.3-2",
      "3.9.4-1",
      "3.9.4-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-24281.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#55886 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement