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CVE-2026-42586
medium
CVSS 6.8
Vulnerability in io.netty:netty-codec-redis (CVE-2026-42586)
Summary
vulnerability in io.netty:netty-codec-redis (CVE-2026-42586). Data can be tampered with by attackers. Exploitable via ``io.netty.handler.codec.redis.RedisEncoder``. Mitigation: upgrade to `4.1.133.Final` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-42586** has been found in io.netty:netty-codec-redis.
Attackers can target a specific entry point like ``io.netty.handler.codec.redis.RedisEncoder`` over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 6.8/10.
What to do: upgrade io.netty:netty-codec-redis to **4.1.133.Final** or later.
If unsure, ask your IT team or search "io.netty:netty-codec-redis CVE-2026-42586" on the vendor's site.
CVE-2026-42586 (io.netty:netty-codec-redis) — CWE-93 / CVSS v3 6.8
Attack vector: local / unauthenticated / no user interaction
Attack surface: `io.netty.handler.codec.redis.RedisEncoder` / `RedisEncoder` / `RedisEncoder.java` / `InlineCommandRedisMessage`
Patched: `4.1.133.Final` — 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-93) exists in io.netty:netty-codec-redis. Attackers reach the vulnerable code path via ``io.netty.handler.codec.redis.RedisEncoder`` without authentication.
📍 Affected scope
io.netty:netty-codec-redis — . Attack surface: `io.netty.handler.codec.redis.RedisEncoder` / `RedisEncoder` / `RedisEncoder.java` / `InlineCommandRedisMessage`.
🔥 Severity
Severity: Medium (CVSS 6.8/10). Data can be tampered with by attackers
🔧 How to fix
Update to **4.1.133.Final**.
🛡️ 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 'io.netty:netty-codec-redis' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'io.netty:netty-codec-redis' . | 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 `io.netty:netty-codec-redis` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade io.netty:netty-codec-redis to 4.1.133.Finalステージング環境で 4.1.133.Final 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Maven
io.netty:netty-codec-redis
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.133.Final"}]}]
References
- package https://github.com/netty/netty
- web https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4
- web https://github.com/netty/netty/security/advisories/GHSA-jq43-27x9-3v86
- web https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7
- web https://redis.io/docs/reference/protocol-spec
- web https://nvd.nist.gov/vuln/detail/CVE-2026-42586
- web https://github.com/advisories/GHSA-rgrr-p7gp-5xj7