The vulnerability of the UPLOAD_DIR configuration and the UPLOAD_KEEP_FILENAME=True setting in the python-multipart streaming multi-component parser allows a attacker to write arbitrary files.

🗓️ 30 Jan 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType

bdu_fstec

bdu_fstec🔗 bdu.fstec.ru👁 1 Views

The UPLOAD_DIR and UPLOAD_KEEP_FILENAME=True settings in the python-multipart parser enable remote arbitrary file writes.

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Source	Link
github	www.github.com/Kludex/python-multipart/commit/9433f4bbc9652bdde82bbe380984e32f8cfc89c4
github	www.github.com/Kludex/python-multipart/releases/tag/0.0.22
github	www.github.com/Kludex/python-multipart/security/advisories/GHSA-wp53-j4wj-2cfg
web	www.web.nvd.nist.gov/view/vuln/detail

18 Feb 2026 00:00Current

6.5Medium risk

Vulners AI Score6.5

CVSS 38.6

CVSS 29

EPSS0.02228

upload directory keep filename true python multipart streaming parser arbitrary file write path restriction