CVE-2026-116272

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{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "modules": ["MIME::Field::ParamVal"], "packageName": "MIME-tools", "packageURL": "pkg:cpan/MIME-tools", "programFiles": ["lib/MIME/Field/ParamVal.pm"], "programRoutines": [{"name": "MIME::Field::ParamVal::parse_params"}], "repo": "https://salsa.debian.org/dskoll/mime-tools", "versions": [{"lessThan": "5.521", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-116272", "lastModified": "2026-11-05T21:18:38.997", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-116272", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T20:39:55.511767Z", "version": "2.0.3"}}]}, "published": "2026-10-28T18:17:13.690", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-436"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{"bugzilla": {"description": "perl-mime-tools: perl-mime-tools: Security filter bypass via nested comments in boundary parameters", "id": "2563048", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563048"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-115", "details": ["MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter whose name contains a nested comment.\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.\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.", "A flaw was found in perl-mime-tools. A remote attacker can bypass email security filters by sending a specially crafted message containing duplicate Multipurpose Internet Mail Extensions (MIME) boundary parameters with nested comments. Because the parser fails to properly normalize parameter names containing comments, it treats duplicate boundaries as separate entries rather than flagging them as duplicates. This parsing discrepancy allows an attacker to conceal malicious email attachments from security inspection tools while the recipient's email client displays them."], "name": "CVE-2026-116272", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "perl-MIME-tools", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2026-10-28T17:34:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-116272\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-116272\nhttps://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,5.521)"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}]}, "product": "mime::field::paramval", "vendor": "perl"}], "created": "2026-10-28T20:00:18.303405+00:00", "updated": "2026-10-30T13:45:15.115651+00:00", "vendors": ["perl", "perl$PRODUCT$mime::field::paramval"]}