{"id":"CVE-2026-116265","aliases":[],"cve":{"records":[{"id":"CVE-2026-116265","source":"CPANSec","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-25T18:05:02.235Z","published":"2026-10-28T17:32:11.827Z","modified":"2026-10-28T17:32:11.827Z"}],"publishers":[{"name":"CPANSec","role":"CNA","organizationId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","modified":"2026-10-28T17:32:11.827Z"}],"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 an ambiguous multipart boundary written as RFC 2231 continuations","titleSource":"CPANSec","descriptionSource":"CPANSec","description":"MIME::Field::ParamVal versions before 5.521 for Perl do not flag an ambiguous multipart boundary written as RFC 2231 continuations.\n\nThe boundary ambiguity checks look only at a plain boundary= parameter, and a boundary split into RFC 2231 sections (boundary*0=, boundary*1= and so on) is joined after they have run. A repeated section number is concatenated rather than reported as a duplicate. From version 5.518, an encoded word or trailing whitespace in such a boundary also goes unflagged, although multipart_boundary() decodes or strips it.\n\nA remote sender can make MIME::Parser split a message on a different boundary than other mail readers, hiding an attachment from a filter that relies on ambiguous_content() while the recipient's mail client shows it.","score":null,"severity":"unknown","published":"2026-10-28T17:32:11.827Z","modified":"2026-10-28T17:32:11.827Z","withdrawn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-2026-116265"}],"remediation":[{"text":"Upgrade to MIME-tools 5.521 or later.","source":"CPANSec","url":"https://www.cve.org/CVERecord?id=CVE-2026-116265"}],"references":["https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"],"sources":[{"name":"CVE","id":"CVE-2026-116265","modified":"2026-10-28T17:32:11.827Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116265"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-10-29T14:34:58.783Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T09:10:30.844Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-10-28T18:10:34.203Z","attemptedAt":"2026-10-28T18:10:34.203Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-28T18:10:34.155Z","attemptedAt":"2026-10-28T18:10:34.155Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T18:10:33.145Z","attemptedAt":"2026-10-28T18:10:33.145Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-28T18:10:34.047Z","attemptedAt":"2026-10-28T18:10:34.047Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-112297","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112297","modified":"Oct 28, 2026, 5:32:11 PM","checkedAt":"2026-10-28T18:10:33.145Z"}],"aiSummary":{"text":"MIME::Field::ParamVal versions before 5.521 for Perl do not flag ambiguous multipart boundaries, allowing a remote sender to potentially hide attachments. The issue arises from incomplete boundary ambiguity checks. A sender can exploit this weakness.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:47:57.120Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-116265"}]}}