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CVE-2023-46136 high CVSS 8.0

Vulnerability in werkzeug (CVE-2023-46136)

Summary

Vulnerability in werkzeug (CVE-2023-46136). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.3.8 or later.

Original description

The description as published by the source.

Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.

This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2023-46136 has been found in werkzeug.
Risk of unauthorized operations or information disclosure. CVSS score: 8.0/10.
What to do: upgrade werkzeug to 2.3.8 or later.
If unsure, ask your IT team or search "werkzeug CVE-2023-46136" on the vendor's site.

CVE-2023-46136 (werkzeug) — CWE-400 / CVSS v3 8.0
Attack vector: adjacent-network / no user interaction
Patched: 2.3.8 — 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 werkzeug.

📍 Affected scope

Check the vendor advisory for the affected versions of werkzeug.

🔥 Severity

Severity: High (CVSS 8.0/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 2.3.8.

🛡️ 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 'werkzeug' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'werkzeug' . | 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 werkzeug を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade werkzeug to 2.3.8

    ステージング環境で 2.3.8 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を含めること。

  3. 3
    Post-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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip werkzeug
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.8"}]}]
PyPI werkzeug
[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0rc1"},{"fixed":"2.3.8"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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