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GHSA-VR34-M3CJ-MGXG

Vulnerability from github – Published: 2026-10-09 12:31 – Updated: 2026-10-09 12:31

Details

In 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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-107938"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-09T11:17:02Z",
    "severity": null
  },
  "details": "In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not verify that the hostname in the server\u2019s 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\u2019s 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.\u00a0\nUsers are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.",
  "id": "GHSA-vr34-m3cj-mgxg",
  "modified": "2026-10-09T12:31:43Z",
  "published": "2026-10-09T12:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107938"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/ljsjsq1foyjy1v5o22oncw80twx7k2tc"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/10/09/13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-107938 (GCVE-0-2026-107938)

Vulnerability from cvelistv5 – Published: 2026-10-09 10:20 – Updated: 2026-10-09 11:07

Title

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

Summary

Severity

No CVSS data available.

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 938 records in the last 180 days details

References

2 references

URL	Tags
https://lists.apache.org/thread.html/ljsjsq1foyjy…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/1…

Impacted products

1 product

Vendor	Product	Version
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)

Credits

This issue was found using Claude agents to study the security of open-source projects

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JSON

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          "dateUpdated": "2026-10-09T11:07:53.753Z",
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            "url": "http://www.openwall.com/lists/oss-security/2026/10/09/13"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "product": "Apache CXF",
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          "versions": [
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              "lessThan": "4.2.4",
              "status": "affected",
              "version": "4.2.0",
              "versionType": "semver"
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    "dateReserved": "2026-10-09T09:19:43.226Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-VR34-M3CJ-MGXG

CVE-2026-107938 (GCVE-0-2026-107938)

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