CVE-2026-107937Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion.
Updated under an hour ago ()
Does this affect you?
It affects Apache Software Foundation Apache CXF and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.56%, higher than 45% of scored CVEs.
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Free account, 1 product
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.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.56% (percentile 45)
- Assigned by
- apache
- NVD analysis
- Analyzed
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Software Foundation Apache CXF apache_software_foundation:apache_cxf (from the name) | from 4.2.0 before 4.2.4; from 4.0.0 before 4.1.9; before 3.6.13 | CNA record |
apache cxf apache:cxf | before 3.6.13; from 4.0.0 before 4.1.9; from 4.2.0 before 4.2.4 | NVD |
References
- https://lists.apache.org/thread.html/x9twtpv3d04qj83t6w9xkh9y2q28zztjvendor-advisory, issue-tracking, mailing-list
- http://www.openwall.com/lists/oss-security/2026/10/09/12mailing-list, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.