VulnerabilityAnalyzed

CVE-2026-53540

This vulnerability is fixed in 0.0.31.

LOW 3.7EPSS 0.34%

Does this matter?

Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.

Description

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 3.1: 3.7 LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.34% probability · 27th percentile
CISA KEV: Not listed
Weakness: CWE-1284
Affected: fastapiexpert/python-multipart
Source: security-advisories@github.com

References

https://github.com/Kludex/python-multipart/security/advisories/GHSA-v9pg-7xvm-68hfVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.