{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107937", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-10-09T09:12:15.139Z", "datePublished": "2026-10-09T10:19:53.377Z", "dateUpdated": "2026-10-09T10:19:53.377Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-09T10:19:53.377Z"}, "title": "Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion.", "source": {"discovery": "UNKNOWN"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache CXF", "packageURL": "pkg:maven/org.apache.cxf/cxf-core", "versions": [{"status": "affected", "version": "4.2.0", "lessThan": "4.2.4", "versionType": "semver"}, {"status": "affected", "version": "4.0.0", "lessThan": "4.1.9", "versionType": "semver"}, {"status": "affected", "version": "0", "lessThan": "3.6.13", "versionType": "semver"}], "defaultStatus": "unaffected", "collectionURL": "https://repo.maven.apache.org/maven2", "packageName": "org.apache.cxf:cxf-core"}], "descriptions": [{"value": "In Apache CXF, the parser for multipart/MTOM attachment part headers did not fully enforce the configured attachment-max-header-size (default 300 characters) and attachment-headers-max-count (default 500) limits. The size limit was applied only to each physical line, not to a header value built from continuation lines or to the combined values of a repeated header. The count limit was checked against the number of distinct header names, not the total number of header lines. A remote, unauthenticated attacker could send a multipart request with very large folded or repeated part headers. The server would then allocate memory without bound, causing a denial of service.\u00a0\nUsers are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "In Apache CXF, the parser for multipart/MTOM attachment part headers did not fully enforce the configured <code>attachment-max-header-size</code> (default 300 characters) and <code>attachment-headers-max-count</code> (default 500) limits. The size limit was applied only to each physical line, not to a header value built from continuation lines or to the combined values of a repeated header. The count limit was checked against the number of distinct header names, not the total number of header lines. A remote, unauthenticated attacker could send a multipart request with very large folded or repeated part headers. The server would then allocate memory without bound, causing a denial of service.&nbsp;<br>Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue."}]}], "references": [{"url": "https://lists.apache.org/thread.html/x9twtpv3d04qj83t6w9xkh9y2q28zztj", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "low"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "This issue was found using Claude agents to study the security of open-source projects and independently by Mike Read (github.com/Michael-JRead)", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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