{"id":"USN-8343-1","summary":"multipart vulnerability","details":"It was discovered that multipart had an ambiguous regular expression\nalternation when handling certain HTTP header values. A remote attacker\ncould possibly use this issue to cause multipart to use excessive\nresources, leading to a denial of service.","modified":"2026-06-30T18:16:42.766265696Z","published":"2026-05-28T17:53:21Z","related":["UBUNTU-CVE-2026-28356"],"upstream":["UBUNTU-CVE-2026-28356"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8343-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-28356"}],"affected":[{"package":{"name":"multipart","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/multipart?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.1-2+deb13u1build0.25.10.1"}]}],"versions":["1.2.1-2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.2.1-2+deb13u1build0.25.10.1","binary_name":"python3-multipart"}]},"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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-28356"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8343-1.json"}},{"package":{"name":"multipart","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/multipart?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.0-3ubuntu0.1"}]}],"versions":["1.2.1-2","1.3.0-3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-multipart","binary_version":"1.3.0-3ubuntu0.1"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[{"id":"CVE-2026-28356","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8343-1.json"}}],"schema_version":"1.7.5"}