Apache CXF: The Netty HTTP client transport does not perform TLS hostname verification.

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107938
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 Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not verify that the hostname in the server’s TLS certificate matched the host being called. This applied over both HTTP/1.1 and HTTP/2, even when disableCNCheck was left at its default value of false. The certificate chain was validated against the configured trust store, but the endpoint’s identity was not. A network attacker able to intercept traffic could present any certificate trusted by the client, such as a publicly issued certificate for a domain they control, and impersonate the target service. They could then read or modify the exchanged messages, including credentials.  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: 0.001150000 probability, percentile 0.014680000 (date 2026-10-10)

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/2026/10/09/13 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread.html/ljsjsq1foyjy1v5o22oncw80twx7k2tc [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 (en)

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