{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-116270", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-10-25T18:05:02.236Z", "datePublished": "2026-10-28T17:33:48.187Z", "dateUpdated": "2026-10-28T17:33:48.187Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "modules": ["MIME::Words"], "packageName": "MIME-tools", "packageURL": "pkg:cpan/MIME-tools", "programFiles": ["lib/MIME/Words.pm", "lib/MIME/Head.pm"], "programRoutines": [{"name": "MIME::Words::decode_mimewords"}, {"name": "MIME::Head::multipart_boundary"}], "repo": "https://salsa.debian.org/dskoll/mime-tools", "versions": [{"lessThan": "5.521", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "MIME::Words versions before 5.521 for Perl allow memory exhaustion via repeated \"=?\" sequences in decode_mimewords.\n\nFor each \"=?\" that does not start a complete encoded word, decode_mimewords appends an error message containing the whole input string to $@. A boundary of 8,000 \"=?\" pairs (16,000 bytes) adds 8,000 copies of itself to $@, about 128 MB.\n\nFrom version 5.518, MIME::Parser decodes every multipart boundary this way, so a remote sender can exhaust the memory of the parsing process with one Content-Type header."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "description": "CWE-407 Inefficient Algorithmic Complexity", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-10-28T17:33:48.187Z"}, "references": [{"tags": ["release-notes"], "url": "https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"}], "solutions": [{"lang": "en", "value": "Upgrade to MIME-tools 5.521 or later."}], "source": {"discovery": "UNKNOWN"}, "title": "MIME::Words versions before 5.521 for Perl allow memory exhaustion via repeated \"=?\" sequences in decode_mimewords", "x_generator": {"engine": "cpansec-cna-tool 0.1"}}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "modules": ["MIME::Words"], "packageName": "MIME-tools", "packageURL": "pkg:cpan/MIME-tools", "programFiles": ["lib/MIME/Words.pm", "lib/MIME/Head.pm"], "programRoutines": [{"name": "MIME::Words::decode_mimewords"}, {"name": "MIME::Head::multipart_boundary"}], "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::Words versions before 5.521 for Perl allow memory exhaustion via repeated \"=?\" sequences in decode_mimewords.\n\nFor each \"=?\" that does not start a complete encoded word, decode_mimewords appends an error message containing the whole input string to $@. A boundary of 8,000 \"=?\" pairs (16,000 bytes) adds 8,000 copies of itself to $@, about 128 MB.\n\nFrom version 5.518, MIME::Parser decodes every multipart boundary this way, so a remote sender can exhaust the memory of the parsing process with one Content-Type header."}], "id": "CVE-2026-116270", "lastModified": "2026-10-29T15:11:53.000", "metrics": {}, "published": "2026-10-28T18:17:13.470", "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-407"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{"bugzilla": {"description": "perl-MIME-tools: perl-MIME-tools: Denial of Service via memory exhaustion from crafted MIME headers", "id": "2563052", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563052"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["MIME::Words versions before 5.521 for Perl allow memory exhaustion via repeated \"=?\" sequences in decode_mimewords.\nFor each \"=?\" that does not start a complete encoded word, decode_mimewords appends an error message containing the whole input string to $@. A boundary of 8,000 \"=?\" pairs (16,000 bytes) adds 8,000 copies of itself to $@, about 128 MB.\nFrom version 5.518, MIME::Parser decodes every multipart boundary this way, so a remote sender can exhaust the memory of the parsing process with one Content-Type header.", "A flaw was found in perl-MIME-tools. The message header decoding routine improperly accumulates error messages when processing repeated malformed encoded word sequences. A remote attacker can exploit this vulnerability by submitting a specially crafted message header, causing excessive memory consumption and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-116270", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "perl-MIME-tools", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2026-10-28T17:33:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-116270\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-116270\nhttps://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,5.521)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "product": "mime::words", "vendor": "perl"}], "created": "2026-10-28T19:15:14.765297+00:00", "updated": "2026-10-30T13:45:15.121252+00:00", "vendors": ["perl", "perl$PRODUCT$mime::words"]}