Update dependency python-multipart to v0.0.22 [SECURITY] - autoclosed

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
python-multipart (changelog)	==0.0.20 → ==0.0.22

GitHub Vulnerability Alerts

CVE-2026-24486

Summary

A Path Traversal vulnerability exists when using non-default configuration options UPLOAD_DIR and UPLOAD_KEEP_FILENAME=True. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename.

Details

When UPLOAD_DIR is set and UPLOAD_KEEP_FILENAME is True, the library constructs the file path using os.path.join(file_dir, fname). Due to the behavior of os.path.join(), if the filename begins with a /, all preceding path components are discarded:

os.path.join("/upload/dir", "/etc/malicious") == "/etc/malicious"

This allows an attacker to bypass the intended upload directory and write files to arbitrary paths.

Affected Configuration

Projects are only affected if all of the following are true:

• UPLOAD_DIR is set
• UPLOAD_KEEP_FILENAME is set to True
• The uploaded file exceeds MAX_MEMORY_FILE_SIZE (triggering a flush to disk)

The default configuration is not vulnerable.

Impact

Arbitrary file write to attacker-controlled paths on the filesystem.

Mitigation

Upgrade to version 0.0.22, or avoid using UPLOAD_KEEP_FILENAME=True in project configurations.

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Release Notes

Kludex/python-multipart (python-multipart)

v0.0.22

Compare Source

• Drop directory path from filename in File 9433f4b.

v0.0.21

Compare Source

• Add support for Python 3.14 and drop EOL 3.8 and 3.9 #​216.

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