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CVE-2026-0847
high
CVSS 7.5
Path Traversal in nltk (CVE-2026-0847)
Summary
path traversal in nltk (CVE-2026-0847). Confidential information can be exposed externally. Mitigation: upgrade to `3.9.3` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-0847** has been found in nltk.
Confidential information can be exposed externally. CVSS score: 7.5/10.
What to do: upgrade nltk to **3.9.3** or later.
If unsure, ask your IT team or search "nltk CVE-2026-0847" on the vendor's site.
CVE-2026-0847 (nltk) — CWE-22 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `3.9.3` — 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 nltk.
📍 Affected scope
nltk — .
🔥 Severity
Severity: High (CVSS 7.5/10). Confidential information can be exposed externally
🔧 How to fix
Update to **3.9.3**.
🛡️ 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 'nltk' .` 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 'nltk' . | 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 `nltk` 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 nltk to 3.9.3ステージング環境で 3.9.3 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
nltk
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.9.3"}]}]
pip
nltk
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-0847
- advisory https://github.com/advisories/GHSA-68j8-pq59-fqgm
- exploit [email protected]
- package https://github.com/nltk/nltk
- web https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-98.yaml
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c