DEBIAN-CVE-2026-53537
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-53537
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53537.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-53537
- Upstream
- Published
- 2026-06-22T18:16:44Z
- Modified
- 2026-08-27T23:06:27Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
- Summary
- [none]
- Details
-
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, parse_options_header parsed Content-Disposition (and Content-Type) headers with email.message.Message, which transparently applies RFC 2231/5987 decoding. The extended parameter syntax (filename*=charset'lang'value, name*=..., and the filename0/filename1 continuation form) is decoded and surfaced under the bare filename/name key, and overrides the plain parameter when both are present. RFC 7578 ยง4.2 explicitly forbids the filename* form in multipart/form-data. Components that follow RFC 7578, or that do not implement RFC 2231/5987 decoding for multipart/form-data (WAFs, proxies, gateways), may interpret such a header differently. An attacker can exploit that difference to smuggle a different field name or filename past an upstream inspector to the backend. This vulnerability is fixed in 0.0.30.
- References
Affected packages
Debian:13 / python-multipart
Package
- Name
- python-multipart
- Purl
- pkg:deb/debian/python-multipart?arch=source&distro=trixie
Debian:14 / python-multipart
Package
- Name
- python-multipart
- Purl
- pkg:deb/debian/python-multipart?arch=source&distro=forky