CVE-2026-53540
Python-Multipart: Negative Content-Length in parse_form buffers the entire body in memory
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.
INFO
Published Date :
June 22, 2026, 4:58 p.m.
Last Modified :
June 22, 2026, 4:58 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-53540
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Python-Multipart to version 0.0.31 or newer.
- Ensure Content-Length header is validated.
- Limit memory usage for large uploads.
- Implement chunked reading for requests.
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CVE-2026-53540 vulnerability anywhere in the article.