DEBIAN-CVE-2026-28356
multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parse_options_header() function in multipart.py uses a regular expression with an ambiguous alternation, which can cause exponential backtracking (ReDoS) when parsing maliciously crafted HTTP or multipart segment headers. This can be abused for denial of service (DoS) attacks against web applications using this library to parse request headers or multipart/form-data streams. The issue is fixed in 1.2.2, 1.3.1 and 1.4.0-dev.
DEBIAN-CVE-2026-28356
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-28356
multipart
Source reference: /affected/0/package/name
- Affected versions
- 1.2.1-2
Source reference:
/affected/0/versions - Fixed versions
- 1.2.1-2+deb13u1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
multipart
Source reference: /affected/1/package/name
- Affected versions
- 1.2.1-2
Source reference:
/affected/1/versions1.3.0-1Source reference:
/affected/1/versions1.3.0-2Source reference:
/affected/1/versions1.3.0-3Source reference:
/affected/1/versions - Fixed versions
- 1.3.1-1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.1-2+deb13u1"
}
]
}
],
"package": {
"name": "multipart",
"purl": "pkg:deb/debian/multipart?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.2.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28356.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.1-1"
}
]
}
],
"package": {
"name": "multipart",
"purl": "pkg:deb/debian/multipart?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.2.1-2",
"1.3.0-1",
"1.3.0-2",
"1.3.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28356.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56342 · Revision 1
- Added to Heist Feed
- Publisher date