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.
Original description
The description as published by the source.
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the Netty Redis codec encoder (RedisEncoder) writes user-controlled string content directly to the network output buffer without validating or sanitizing CRLF (\r\n) characters. Since the Redis Serialization Protocol (RESP) uses CRLF as the command/response delimiter, an attacker who can control the content of a Redis message can inject arbitrary Redis commands or forge fake responses. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
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-2026-42586 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.
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.
Check the vendor advisory for the affected versions of io.netty:netty-codec-redis. Attack surface: io.netty.handler.codec.redis.RedisEncoder / RedisEncoder / RedisEncoder.java / InlineCommandRedisMessage.
Severity: Medium (CVSS 6.8/10). Data can be tampered with by attackers.
Update to 4.1.133.Final.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで io.netty:netty-codec-redis を使っているサービスとバージョンを洗い出す。
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2Apply 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を含めること。
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3Post-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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-42586 netty
- Ubuntu UBUNTU-CVE-2026-42586 netty
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com
- web github.com
- web redis.io
- web github.com