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CVE-2026-21863 high CVSS 7.5

Out-of-Bounds Read in valkey (CVE-2026-21863)

Summary

Vulnerability in valkey (CVE-2026-21863). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 7.2.12, 8.0.7, 8.1.6, 9.0.2 or later.

Original description

The description as published by the source.

Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

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-2026-21863 has been found in valkey.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade valkey to 7.2.12, 8.0.7, 8.1.6, 9.0.2 or later.
If unsure, ask your IT team or search "valkey CVE-2026-21863" on the vendor's site.

CVE-2026-21863 (valkey) — CWE-125 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 7.2.12, 8.0.7, 8.1.6, 9.0.2 — 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

Out-of-bounds read (CWE-125) exists in valkey.

📍 Affected scope

Check the vendor advisory for the affected versions of valkey.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 7.2.12, 8.0.7, 8.1.6, 9.0.2.

🛡️ 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 'valkey' . 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 'valkey' . | 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 valkey 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 valkey to 7.2.12, 8.0.7, 8.1.6, 9.0.2

    ステージング環境で 7.2.12, 8.0.7, 8.1.6, 9.0.2 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 valkey
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.2.12"},{"introduced":"8.0.0"},{"fixed":"8.0.7"},{"introduced":"8.1.0"},{"fixed":"8.1.6"},{"introduced":"9.0.0"},{"fixed":"9.0.2"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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