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

[renovate]

This PR contains the following updates:

Package	Update	Change	OpenSSF
python-multipart (changelog)	patch	==0.0.18 → ==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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Python-Multipart has Arbitrary File Write via Non-Default Configuration

GHSA-wp53-j4wj-2cfg

More information

Details

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.

Severity

• CVSS Score: 8.6 / 10 (High)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

References

• https://github.com/Kludex/python-multipart/security/advisories/GHSA-wp53-j4wj-2cfg
• https://github.com/Kludex/python-multipart/commit/9433f4bbc9652bdde82bbe380984e32f8cfc89c4
• https://github.com/Kludex/python-multipart
• https://github.com/Kludex/python-multipart/releases/tag/0.0.22

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

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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.

v0.0.20

Compare Source

• Handle messages containing only end boundary #​142.

v0.0.19

Compare Source

• Don't warn when CRLF is found after last boundary on MultipartParser #​193.

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