CVE-2026-107937 (GCVE-0-2026-107937)

Vulnerability from cvelistv5 – Published: 2026-10-09 10:19 – Updated: 2026-10-15 17:45
VLAI
Title
Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion.
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 17:45 UTC
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1085 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache CXF Affected: 4.2.0 , < 4.2.4 (semver)
Affected: 4.0.0 , < 4.1.9 (semver)
Affected: 0 , < 3.6.13 (semver)
guessed Create a notification for this product.
Credits
This issue was found using Claude agents to study the security of open-source projects and independently by Mike Read (github.com/Michael-JRead)
Show details on NVD website
To clipboard 

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