DEBIAN-CVE-2026-53538

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Source
https://security-tracker.debian.org/tracker/CVE-2026-53538
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53538.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-53538
Upstream
Published
2026-06-22T18:16:44Z
Modified
2026-09-01T16:06:50Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/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, QuerystringParser treated ; as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL standard, modern browsers, and Python's urllib.parse (since the CVE-2021-23336 fix) treat only & as a separator. This creates a parser differential: the same bytes are tokenized into different fields than a WHATWG compliant intermediary would produce, allowing an attacker to smuggle extra form fields past an upstream body inspecting component. This vulnerability is fixed in 0.0.30.

References

Affected packages

Debian:12 / python-multipart

Package

Name
python-multipart
Purl
pkg:deb/debian/python-multipart?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.0.5-3
0.0.6-1
0.0.9-1
0.0.17-1
0.0.17-2
0.0.17-3
0.0.17-4
0.0.17-5
0.0.20-1
0.0.20-1.1~deb13u1
0.0.20-1.1
0.0.22-1
0.0.26-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53538.json"

Debian:13 / python-multipart

Package

Name
python-multipart
Purl
pkg:deb/debian/python-multipart?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.0.20-1
0.0.20-1.1~deb13u1
0.0.20-1.1
0.0.22-1
0.0.26-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53538.json"

Debian:14 / python-multipart

Package

Name
python-multipart
Purl
pkg:deb/debian/python-multipart?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.0.20-1
0.0.20-1.1~deb13u1
0.0.20-1.1
0.0.22-1
0.0.26-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53538.json"