Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion.

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107937
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-09 11:17:02 UTC
Updated2026-10-09 16:33:39 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002380000 probability, percentile 0.136780000 (date 2026-10-11)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache CXF affected 4.2.0 4.2.4 semver Not specified
CNA Apache Software Foundation Apache CXF affected 4.0.0 4.1.9 semver Not specified
CNA Apache Software Foundation Apache CXF affected 3.6.13 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/10/09/12 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread.html/x9twtpv3d04qj83t6w9xkh9y2q28zztj [email protected] lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: This issue was found using Claude agents to study the security of open-source projects and independently by Mike Read (github.com/Michael-JRead) (en)

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