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CVE-2026-48043 medium CVSS 5.3

Vulnerability in io.netty:netty-codec-http2 (CVE-2026-48043)

Summary

Vulnerability in io.netty:netty-codec-http2 (CVE-2026-48043). Risk of unauthorized operations or information disclosure. Exploitable via DelegatingDecompressorFrameListener. Mitigation: upgrade to 4.2.15.Final or later.

Original description

The description as published by the source.

Impact

The DelegatingDecompressorFrameListener class orchestrates HTTP/2 decompression by embedding a per-stream EmbeddedChannel that runs the appropriate decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each decompressed chunk is a pooled ByteBuf handed to an anonymous ChannelInboundHandlerAdapter tail handler, which becomes the sole owner responsible for releasing it.

A remote peer could send frames that would result in the flow-controller throwing and so trigger a resource leak which at the end might take down the whole JVM due OOME.

Source: GitHub Security Advisories (Global) 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-2026-48043 has been found in io.netty:netty-codec-http2.
Attackers can target a specific entry point like DelegatingDecompressorFrameListener over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade io.netty:netty-codec-http2 to 4.2.15.Final or later.
If unsure, ask your IT team or search "io.netty:netty-codec-http2 CVE-2026-48043" on the vendor's site.

CVE-2026-48043 (io.netty:netty-codec-http2) — CWE-400 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: DelegatingDecompressorFrameListener / EmbeddedChannel / ByteBuf / ChannelInboundHandlerAdapter
Patched: 4.2.15.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-400) exists in io.netty:netty-codec-http2. Attackers reach the vulnerable code path via DelegatingDecompressorFrameListener without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of io.netty:netty-codec-http2. Attack surface: DelegatingDecompressorFrameListener / EmbeddedChannel / ByteBuf / ChannelInboundHandlerAdapter.

🔥 Severity

Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 4.2.15.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. Audit SBOM/dependencies to find affected services.

Response actions

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

  1. 1
    Identify 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-http2 を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade io.netty:netty-codec-http2 to 4.2.15.Final

    ステージング環境で 4.2.15.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。

  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

maven io.netty:netty-codec-http2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.15.Final"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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