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DEBIAN-CVE-2026-28356

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

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/versions

1.3.0-1

Source reference: /affected/1/versions

1.3.0-2

Source reference: /affected/1/versions

1.3.0-3

Source 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
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Publisher date
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