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CVE-2026-64643
medium
CVSS 5.3
Vulnerability in next (CVE-2026-64643)
Summary
vulnerability in next (CVE-2026-64643). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `16.2.11` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-64643** has been found in next.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade next to **16.2.11** or later.
If unsure, ask your IT team or search "next CVE-2026-64643" on the vendor's site.
CVE-2026-64643 (next) — CWE-201 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `16.2.11` — apply immediately
Workaround: Never assume any authentication claims at the `use cache` or `use server` boundary.
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-201) exists in next.
📍 Affected scope
next — .
🔥 Severity
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **16.2.11**.
🛡️ Workaround
Workaround: Never assume any authentication claims at the `use cache` or `use server` boundary.
🔍 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
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1Identify 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。
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5Apply temporary workaround mitigate
Never assume any authentication claims at the `use cache` or `use server` boundary.パッチが適用されるまでの応急処置として、Never assume any authentication claims at the `use cache` or `use server` boundary. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade next to 16.2.11ステージング環境で 16.2.11 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
npm
next
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"16.2.11"}]}]
References
- patch [email protected]
- patch [email protected]
- patch [email protected]
- web [email protected]
- web [email protected]
- web https://github.com/advisories/GHSA-955p-x3mx-jcvp