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CVE-2026-48988
medium
CVSS 5.3
Vulnerability in markdown-it (CVE-2026-48988)
Summary
vulnerability in markdown-it (CVE-2026-48988). Risk of unauthorized operations or information disclosure. Exploitable via ``token.content``. Mitigation: upgrade to `14.2.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-48988** has been found in markdown-it.
Attackers can target a specific entry point like ``token.content`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade markdown-it to **14.2.0** or later.
If unsure, ask your IT team or search "markdown-it CVE-2026-48988" on the vendor's site.
CVE-2026-48988 (markdown-it) — CWE-400 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `token.content` / `typographer` / `false`
Patched: `14.2.0` — 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 markdown-it. Attackers reach the vulnerable code path via ``token.content`` without authentication.
📍 Affected scope
markdown-it — . Attack surface: `token.content` / `typographer` / `false`.
🔥 Severity
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **14.2.0**.
🛡️ 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 'markdown-it' .` 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 'markdown-it' . | 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 `markdown-it` 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 markdown-it to 14.2.0ステージング環境で 14.2.0 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
markdown-it
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"14.2.0"}]}]