Vulnerability-Lookup

GHSA-7CPR-66JM-X98H

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

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-107937"
  ],
  "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 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.\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-7cpr-66jm-x98h",
  "modified": "2026-10-09T12:31:43Z",
  "published": "2026-10-09T12:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107937"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/x9twtpv3d04qj83t6w9xkh9y2q28zztj"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/10/09/12"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-10-09 10:19 – Updated: 2026-10-09 11:07

Title

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

Summary

Severity

No CVSS data available.

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 939 records in the last 180 days details

References

2 references

URL	Tags
https://lists.apache.org/thread.html/x9twtpv3d04q…	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 and independently by Mike Read (github.com/Michael-JRead)

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JSON

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        "providerMetadata": {
          "dateUpdated": "2026-10-09T11:07:52.472Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/10/09/12"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "collectionURL": "https://repo.maven.apache.org/maven2",
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          "packageName": "org.apache.cxf:cxf-core",
          "packageURL": "pkg:maven/org.apache.cxf/cxf-core",
          "product": "Apache CXF",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "4.2.4",
              "status": "affected",
              "version": "4.2.0",
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              "status": "affected",
              "version": "4.0.0",
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      "metrics": [
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    "dateReserved": "2026-10-09T09:12:15.139Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-7CPR-66JM-X98H

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

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