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CVE-2026-24281 high CVSS 7.4

Vulnerability in zookeeper (CVE-2026-24281)

Summary

Vulnerability in zookeeper (CVE-2026-24281). Confidential information can be exposed externally. Mitigation: upgrade to 3.8.6, 3.9.5 or later.

Original description

The description as published by the source.

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.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-24281 has been found in zookeeper.
Confidential information can be exposed externally. CVSS score: 7.4/10.
What to do: upgrade zookeeper to 3.8.6, 3.9.5 or later.
If unsure, ask your IT team or search "zookeeper CVE-2026-24281" on the vendor's site.

CVE-2026-24281 (zookeeper) — CWE-295 / CVSS v3 7.4
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 3.8.6, 3.9.5 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-295) exists in zookeeper.

📍 Affected scope

Check the vendor advisory for the affected versions of zookeeper.

🔥 Severity

Severity: High (CVSS 7.4/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 3.8.6, 3.9.5.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'zookeeper' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'zookeeper' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で zookeeper を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade zookeeper to 3.8.6, 3.9.5

    ステージング環境で 3.8.6, 3.9.5 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Bitnami zookeeper
[{"type":"SEMVER","events":[{"introduced":"3.8.0"},{"fixed":"3.8.6"},{"introduced":"3.9.0"},{"fixed":"3.9.5"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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