USN-8343-1

It was discovered that multipart had an ambiguous regular expression alternation when handling certain HTTP header values. A remote attacker could possibly use this issue to cause multipart to use excessive resources, leading to a denial of service.

References

Affected packages

Ubuntu:25.10 / multipart

Package

Name: multipart
Purl: pkg:deb/ubuntu/multipart?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.2.1-2+deb13u1build0.25.10.1

Affected versions

1.*

1.2.1-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.2.1-2+deb13u1build0.25.10.1",
            "binary_name": "python3-multipart"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:25.10",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-28356"
        }
    ]
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8343-1.json"

Ubuntu:26.04:LTS / multipart