← Back
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.
AI summary snake-internal / snake-material-v2
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
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. Run `grep -r 'io.netty:netty-codec-http2' .` 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
-
1Identify exposure identify
grep -r 'io.netty:netty-codec-http2' . | 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-http2` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply 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。
-
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-http2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.15.Final"}]}]
References
- package https://github.com/netty/netty
- web https://github.com/netty/netty/security/advisories/GHSA-c2gf-v879-257j
- web https://github.com/advisories/GHSA-c2gf-v879-257j
- web https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
- web https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
- web https://nvd.nist.gov/vuln/detail/CVE-2026-48043
- web https://access.redhat.com/errata/RHSA-2026:26017
- web https://access.redhat.com/errata/RHSA-2026:26018
- web https://access.redhat.com/errata/RHSA-2026:26586
- web https://access.redhat.com/security/cve/CVE-2026-48043
- web https://bugzilla.redhat.com/show_bug.cgi?id=2488442
- web https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48043.json
- web https://access.redhat.com/errata/RHSA-2026:34608