← Back
CVE-2026-21851
Path Traversal in monai (CVE-2026-21851)
Summary
path traversal in monai (CVE-2026-21851). Data can be tampered with by attackers. Exploitable via ``_download_from_ngc_private``. Mitigation: upgrade to `1.5.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-21851** has been found in monai.
Attackers can target a specific entry point like ``_download_from_ngc_private`` over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: ?/10.
What to do: upgrade monai to **1.5.2** or later.
If unsure, ask your IT team or search "monai CVE-2026-21851" on the vendor's site.
CVE-2026-21851 (monai) — CWE-22 /
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: `_download_from_ngc_private` / `ngc_private`
Patched: `1.5.2` — 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
**Path traversal** (CWE-22) exists in monai. Attackers reach the vulnerable code path via ``_download_from_ngc_private`` without authentication.
📍 Affected scope
monai — . Attack surface: `_download_from_ngc_private` / `ngc_private`.
🔥 Severity
Severity: ?. Data can be tampered with by attackers
🔧 How to fix
Update to **1.5.2**.
🛡️ 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 'monai' .` 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
-
1Identify exposure identify
grep -r 'monai' . | 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 `monai` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade monai to 1.5.2ステージング環境で 1.5.2 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。
-
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
PyPI
monai
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.2"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-21851
- advisory https://github.com/advisories/GHSA-9rg3-9pvr-6p27
- package https://github.com/Project-MONAI/MONAI
- package https://pypi.org/project/monai
- web https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27
- web https://github.com/Project-MONAI/MONAI/commit/4014c8475626f20f158921ae0cf98ed259ae4d59