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CVE-2026-67422
high
CVSS 7.5
Vulnerability in pymdown-extensions (CVE-2026-67422)
Summary
vulnerability in pymdown-extensions (CVE-2026-67422). Risk of unauthorized operations or information disclosure. Exploitable via ``caret``. Mitigation: upgrade to `10.16.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-67422** has been found in pymdown-extensions.
Attackers can target a specific entry point like ``caret`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade pymdown-extensions to **10.16.1** or later.
If unsure, ask your IT team or search "pymdown-extensions CVE-2026-67422" on the vendor's site.
CVE-2026-67422 (pymdown-extensions) — CWE-1333 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `caret` / `tilde` / `betterem` / `magiclink`
Patched: `10.16.1` — 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-1333) exists in pymdown-extensions. Attackers reach the vulnerable code path via ``caret`` without authentication.
📍 Affected scope
pymdown-extensions — . Attack surface: `caret` / `tilde` / `betterem` / `magiclink`.
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **10.16.1**.
🛡️ 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 'pymdown-extensions' .` 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 'pymdown-extensions' . | 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 `pymdown-extensions` 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 pymdown-extensions to 10.16.1ステージング環境で 10.16.1 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
pip
pymdown-extensions
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.1"}]}]
References
- web https://github.com/facelessuser/pymdown-extensions/commit/c68498598d7b13011bb4571350b6e3612a4ce44b
- web https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-gm37-52c6-37mw
- web https://nvd.nist.gov/vuln/detail/CVE-2026-67422
- web https://github.com/advisories/GHSA-gm37-52c6-37mw