CVE-2026-40347 — Denial of Service
CVE-2026-40347 — Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted `multipart/form-data` requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the nex
What This Means For You
- If your environment is affected by CWE-400, CWE-834, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-40347 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rules · 6 SIEM formats1 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Python Multipart DoS via Crafted Multipart Request - CVE-2026-40347
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-40347 | vulnerability | CVE-2026-40347 |
| CWE-400 | weakness | CWE-400 |
| CWE-834 | weakness | CWE-834 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 18, 2026 at 03:16 UTC |
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