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CVE-2026-47676
medium
CVSS 5.3
Vulnerability in hono (CVE-2026-47676)
Summary
vulnerability in hono (CVE-2026-47676). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `4.12.21` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-47676** has been found in hono.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade hono to **4.12.21** or later.
If unsure, ask your IT team or search "hono CVE-2026-47676" on the vendor's site.
CVE-2026-47676 (hono) — CWE-444 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `4.12.21` — 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-444) exists in hono.
📍 Affected scope
hono — .
🔥 Severity
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **4.12.21**.
🛡️ 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 'hono' .` 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 'hono' . | 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 `hono` 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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6Apply patch patch
Upgrade hono to 4.12.21ステージング環境で 4.12.21 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
hono
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.12.21"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-47676
- package https://github.com/honojs/hono
- web https://github.com/honojs/hono/security/advisories/GHSA-2gcr-mfcq-wcc3
- web https://github.com/honojs/hono/commit/6cbb025ff87fca1a3d00d0ccca0eaf3a6385c3f1
- web https://github.com/honojs/hono/releases/tag/v4.12.21
- web https://github.com/advisories/GHSA-2gcr-mfcq-wcc3