{"id":"CVE-2026-116272","aliases":[],"cve":{"records":[{"id":"CVE-2026-116272","source":"CPANSec","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-25T18:05:02.236Z","published":"2026-10-28T17:34:25.862Z","modified":"2026-10-28T17:34:25.862Z"}],"publishers":[{"name":"CPANSec","role":"CNA","organizationId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","modified":"2026-10-28T17:34:25.862Z"}],"references":[{"url":"https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes","tags":["release-notes"],"source":"CPANSec"}],"weaknesses":[{"id":"CWE-436","description":"CWE-436 Interpretation Conflict","source":"CPANSec"}],"applicability":[],"prioritization":[]},"title":"MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter whose name contains a nested comment","titleSource":"CPANSec","descriptionSource":"CPANSec","description":"MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter whose name contains a nested comment.\n\nA parameter written boundary((c))=\"A\" or boundary(\\))=\"A\" is stored under that literal name rather than as boundary. A second boundary parameter is then not reported as a duplicate, and MIME::Parser splits the message on it.\n\nReaders that skip comments as RFC 5322 allows take the first boundary instead. A remote sender can hide an attachment from a filter that relies on ambiguous_content() while the recipient's mail client shows it.","score":null,"severity":"unknown","published":"2026-10-28T17:34:25.862Z","modified":"2026-10-28T17:34:25.862Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"","name":"MIME-tools","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"5.521","versionType":"custom"}],"defaultStatus":"unaffected","packageURL":"pkg:cpan/MIME-tools","cpes":[],"source":"CPANSec","url":"https://www.cve.org/CVERecord?id=CVE-2026-116272"}],"remediation":[{"text":"Upgrade to MIME-tools 5.521 or later.","source":"CPANSec","url":"https://www.cve.org/CVERecord?id=CVE-2026-116272"}],"references":["https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"],"sources":[{"name":"CVE","id":"CVE-2026-116272","modified":"2026-10-28T17:34:25.862Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116272"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-10-29T14:34:58.783Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T07:50:32.196Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-10-28T17:55:37.104Z","attemptedAt":"2026-10-28T17:55:37.104Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-28T17:55:37.116Z","attemptedAt":"2026-10-28T17:55:37.116Z"},{"source":"EUVD","status":"refresh-failed","attemptedAt":"2026-10-28T17:55:36.177Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-28T17:55:37.301Z","attemptedAt":"2026-10-28T17:55:37.301Z"}],"evidence":[],"aiSummary":{"text":"MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter with a nested comment, potentially hiding attachments from filters. A remote sender can exploit this. The impact depends on the recipient's mail client.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:52:53.999Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-116272"}]}}