UBUNTU-CVE-2026-28356

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Source
https://ubuntu.com/security/CVE-2026-28356
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28356.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-28356
Upstream
Published
2026-03-12T17:16:00Z
Modified
2026-03-19T08:48:06.843560Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parseoptionsheader() 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.

References

Affected packages

Ubuntu:25.10 / multipart

Package

Name
multipart
Purl
pkg:deb/ubuntu/multipart@1.2.1-2?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.2.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-multipart",
            "binary_version": "1.2.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28356.json"