---
cve: "CVE-2026-53540"
severity: "LOW"
cvss: 3.7
epss: "0.3%"
vendor: "Kludex"
kev: false
exploited: false
published: "2026-06-22 18:16:44"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T22:28:10+02:00"
---

# CVE-2026-53540

> 3.7 LOW · 🧪 PoC

## Beschreibung

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.31, parse_form() did not validate the Content-Length header before using it to bound its chunked read of the request body. A negative Content-Length turned the bounded read into a read-until-EOF, so the entire body was loaded into memory in a single read instead of in fixed-size chunks. This vulnerability is fixed in 0.0.31.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 4cffc68a165f7a6f6b7756ce006fabf07a05b7a4 (Commit)

## Referenzen

- <https://github.com/Kludex/python-multipart/security/advisories/GHSA-v9pg-7xvm-68hf>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-53540) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_