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.
Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.
Metrics
Affected Vendors & Products
References
History
Fri, 16 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:* |
Thu, 15 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Sat, 10 Oct 2026 00:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-770 | |
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
|
Fri, 09 Oct 2026 12:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
Fri, 09 Oct 2026 12:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Apache
Apache cxf |
|
| Vendors & Products |
Apache
Apache cxf |
Fri, 09 Oct 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-20 CWE-400 |
Fri, 09 Oct 2026 10:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue. | |
| Title | Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion. | |
| References |
|
Status: PUBLISHED
Assigner: apache
Published: 2026-10-09T10:19:53.377Z
Updated: 2026-10-15T17:45:25.955Z
Reserved: 2026-10-09T09:12:15.139Z
Link: CVE-2026-107937
Updated: 2026-10-09T11:07:52.472Z
Status : Analyzed
Published: 2026-10-09T11:17:02.107
Modified: 2026-10-16T18:10:19.410
Link: CVE-2026-107937