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CVE-2026-59887
high
CVSS 7.5
Vulnerability in linkify-it (CVE-2026-59887)
Summary
vulnerability in linkify-it (CVE-2026-59887). Risk of unauthorized operations or information disclosure. Exploitable via ``src_email_name``. Mitigation: upgrade to `5.0.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-59887** has been found in linkify-it.
Attackers can target a specific entry point like ``src_email_name`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade linkify-it to **5.0.2** or later.
If unsure, ask your IT team or search "linkify-it CVE-2026-59887" on the vendor's site.
CVE-2026-59887 (linkify-it) — CWE-407 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `src_email_name` / `index.mjs` / `pos` / `master`
Patched: `5.0.2` — 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-407) exists in linkify-it. Attackers reach the vulnerable code path via ``src_email_name`` without authentication.
📍 Affected scope
linkify-it — . Attack surface: `src_email_name` / `index.mjs` / `pos` / `master`.
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.0.2**.
🛡️ 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 'linkify-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 'linkify-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 `linkify-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 linkify-it to 5.0.2ステージング環境で 5.0.2 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
linkify-it
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.2"}]}]