Sign in Sign up
JA · EN · FR
SecPulse
← Back
CVE-2026-44576 medium CVSS 5.4

Vulnerability in next (CVE-2026-44576)

Summary

vulnerability in next (CVE-2026-44576). Risk of unauthorized operations or information disclosure. Exploitable via ``RSC``. Mitigation: upgrade to `16.2.5` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-44576** has been found in next. Attackers can target a specific entry point like ``RSC`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: 5.4/10. What to do: upgrade next to **16.2.5** or later. If unsure, ask your IT team or search "next CVE-2026-44576" on the vendor's site.
CVE-2026-44576 (next) — CWE-436 / CVSS v3 5.4 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: `RSC` / `Vary` Patched: `16.2.5` — apply immediately Workaround: If you cannot upgrade immediately, ensure your CDN or reverse proxy keys on the relevant RSC request headers and honors `Vary`, or disable shared caching for affected App Router and RSC responses. 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-436) exists in next. Attackers reach the vulnerable code path via ``RSC`` without authentication.
📍 Affected scope
next — . Attack surface: `RSC` / `Vary`.
🔥 Severity
Severity: Medium (CVSS 5.4/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **16.2.5**.
🛡️ Workaround
Workaround: If you cannot upgrade immediately, ensure your CDN or reverse proxy keys on the relevant RSC request headers and honors `Vary`, or disable shared caching for affected App Router and RSC responses.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'next' .` 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

  1. 1
    Identify exposure identify 
    grep -r 'next' . | 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 `next` を grep し、稼働しているサービス・バージョンを把握する。

  2. 5
    Apply temporary workaround mitigate 
    If you cannot upgrade immediately, ensure your CDN or reverse proxy keys on the relevant RSC request headers and honors `Vary`, or disable shared caching for affected App Router and RSC responses.

    パッチが適用されるまでの応急処置として、If you cannot upgrade immediately, ensure your CDN or reverse proxy keys on the relevant RSC request headers and honors `Vary`, or disable shared caching for affected App Router and RSC responses. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 6
    Apply patch patch 
    Upgrade next to 16.2.5

    ステージング環境で 16.2.5 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。

  4. 7
    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 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

npm next
[{"type":"SEMVER","events":[{"introduced":"16.0.0"},{"fixed":"16.2.5"}]}]

References

🍪 About cookies

We use cookies to keep you logged in, remember your language, and improve the service.

Details →