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CVE-2026-107937— Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion.

Quick assessment

Affected
Apache Software Foundation Apache CXF
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Apache CXF 中，用于解析 multipart/MTOM 附件部分标头的处理器未能完全强制执行配置的附件最大标头大小（默认 300 个字符）和附件标头最大数量（默认 500 个）限制。大小限制仅应用于每个物理行，而未应用于由续行（continuation lines）构建的标头值，也未应用于重复标头的合并值。数量限制仅检查不同标头名称的数量，而非标头行的总数。远程未认证攻击者可以发送包含极大折叠或重复部分标头的 multipart 请求，导致服务器无限分配内存，从而引发拒绝服务（DoS）漏洞。 建议用户

AI Predicted 7.5 Difficulty: Easy

Affected Version Matrix 3

VendorProduct Version RangeStatus
Apache Software Foundation Apache CXF 4.2.0< 4.2.4 affected
4.0.0< 4.1.9 affected
< 3.6.13 affected
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I. Basic Information for CVE-2026-107937

Vulnerability Information
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Vulnerability Title
Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion.
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache CXF 4.2.0 ~ 4.2.4 -

II. Public POCs for CVE-2026-107937

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III. Intelligence Information for CVE-2026-107937

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Mailing List Discussions for CVE-2026-107937 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-09 · 13 CVEs total

CVE-2026-103413 8.8 HIGH Apache Camel Karavan: unvalidated Kubernetes resources applied from a project's kubernetes
CVE-2026-103412 8.8 HIGH Apache Camel Karavan: project file name path traversal when committing a project to Git
CVE-2026-108039 Apache CXF: Prevent unbounded XML document size in StaxUtils by adding default element and
CVE-2026-107938 Apache CXF: The Netty HTTP client transport does not perform TLS hostname verification.
CVE-2026-100227 Apache CXF: XML Signature wrapping in JAX-RS XML Security
CVE-2026-97791 Apache CXF: STSTokenValidator can accept untrusted SAML assertions because it shares valid
CVE-2026-97468 Apache CXF: Authentication bypass via weak cache keys for validated STS tokens
CVE-2026-86463 Apache CXF: FIQL Query Parser Denial of Service
CVE-2026-79650 Apache CXF: OIDC RP Open Redirect
CVE-2026-78384 Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompres
CVE-2026-73179 Apache CXF: JPA authorization-code consume is non-atomic
CVE-2026-71575 Apache CXF: Inoperative max_age authentication-freshness check in OidcClientCodeRequestFil

IV. Related Vulnerabilities

Same product: Apache CXF
Same vendor: Apache Software Foundation

V. Comments for CVE-2026-107937

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