CVE-2026-50645: Apache cxf-core No Restriction On Attachment Headers Vulnerability

Q: What is CVE-2026-50645?

CVE-2026-50645 is a security vulnerability in Apache cxf-core involving No restriction on attachment headers per message under CWE-400: Uncontrolled Resource Consumption.

Q: Which Apache cxf-core versions are affected?

Affected versions include releases prior to 4.1.7, 4.2.2, 3.6.12 across affected packages: org.apache.cxf:cxf-core.

Q: What version fixes CVE-2026-50645?

Upgrading to 4.1.7, 4.2.2, 3.6.12 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is cxf-core affected?

Yes, org.apache.cxf:cxf-core is affected in releases prior to 4.1.7, 4.2.2, 3.6.12. Upgrade your dependency to 4.1.7, 4.2.2, 3.6.12 or later.

Q: What is the CVSS score of CVE-2026-50645?

CVE-2026-50645 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Q: What CWE is associated with CVE-2026-50645?

CVE-2026-50645 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).

Q: How can I check Maven dependencies for CVE-2026-50645?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.cxf'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-ghvc-7hp8-2g2v

CVSS 7.5

CWE-400

Published 2026-06-12

Advisory Summary

CVE-2026-50645 is a HIGH (CVSS 7.5) no restriction on attachment headers vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Apache cxf-core libraries in the Maven ecosystem. The issue involves no restriction on attachment headers per message. Remediation is available by upgrading affected packages to version 4.1.7, 4.2.2, 3.6.12.

CVE-2026-50645 at a Glance

CVE Identifier CVE-2026-50645

GHSA Identifier GHSA-ghvc-7hp8-2g2v

Severity HIGH

CVSS v3.1 Base Score 7.5

CWE Classification CWE-400: Uncontrolled Resource Consumption

Affected Product Apache cxf-core

Package Ecosystem Maven

Published Date 2026-06-12

Last Updated 2026-08-12

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability High (A:H)

How to Fix CVE-2026-50645

To remediate this vulnerability, upgrade all affected Apache cxf-core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.cxf:cxf-core fixed: 4.1.7

<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-core</artifactId>
    <version>4.1.7</version>
</dependency>

org.apache.cxf:cxf-core fixed: 4.2.2

<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-core</artifactId>
    <version>4.2.2</version>
</dependency>

org.apache.cxf:cxf-core fixed: 3.6.12

<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-core</artifactId>
    <version>3.6.12</version>
</dependency>

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

mvn dependency:tree -Dincludes=org.apache.cxf

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-50645, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.cxf

Analyze the terminal output to locate any version of Apache cxf-core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.1.7), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.cxf command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Apache cxf-core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

There is no restriction on the amount of attachment headers that a message can contain when being deserialized by Apache CXF, which can lead to uncontrolled resource consumption or a denial of service attack. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue by imposing a maximum default of 500 attachments per message.

CVE-2026-50645 Affected Apache cxf-core Versions

3 component(s)

Fixed Versions:

4.1.74.2.23.6.12

Product / Package	Ecosystem	Affected Versions	Fixed Version
org.apache.cxf:cxf-core maven/org.apache.cxf/cxf-core	Maven	≥ 4.0.0 < 4.1.7	4.1.7
org.apache.cxf:cxf-core maven/org.apache.cxf/cxf-core	Maven	≥ 4.2.0 < 4.2.2	4.2.2
org.apache.cxf:cxf-core maven/org.apache.cxf/cxf-core	Maven	< 3.6.12	3.6.12

References

NVD — CVE-2026-50645 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-50645

Apache cxf-core Security Information SECURITY

https://cxf.apache.org/security-advisories.data/CVE-2026-50645.txt

Apache cxf-core Source Repository REPOSITORY

https://github.com/apache/cxf

lists.apache.org/thread/24zb7cqcvykh... WEB

https://lists.apache.org/thread/24zb7cqcvykhwm0j797dmdq25s61mj93

Apache cxf-core Security Information SECURITY

http://www.openwall.com/lists/oss-security/2026/06/11/12

Frequently Asked Questions

What is CVE-2026-50645?

CVE-2026-50645 is a security vulnerability in Apache cxf-core involving No restriction on attachment headers per message under CWE-400: Uncontrolled Resource Consumption.

Which Apache cxf-core versions are affected?

Affected versions include releases prior to 4.1.7, 4.2.2, 3.6.12 across affected packages: org.apache.cxf:cxf-core.

What version fixes CVE-2026-50645?

Upgrading to 4.1.7, 4.2.2, 3.6.12 (or the latest patched release for your respective branch) resolves the vulnerability.

Is cxf-core affected?

Yes, org.apache.cxf:cxf-core is affected in releases prior to 4.1.7, 4.2.2, 3.6.12. Upgrade your dependency to 4.1.7, 4.2.2, 3.6.12 or later.

What is the CVSS score of CVE-2026-50645?

CVE-2026-50645 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

What CWE is associated with CVE-2026-50645?

CVE-2026-50645 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).

How can I check Maven dependencies for CVE-2026-50645?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.cxf'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ghvc-7hp8-2g2v",
  "modified" : "2026-08-12T18:43:59Z",
  "published" : "2026-06-12T12:31:34Z",
  "aliases" : [ "CVE-2026-50645" ],
  "summary" : "Apache cxf-core: No restriction on attachment headers per message",
  "details" : "There is no restriction on the amount of attachment headers that a message can contain when being deserialized by Apache CXF, which can lead to uncontrolled resource consumption or a denial of service attack. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue by imposing a maximum default of 500 attachments per message.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.cxf:cxf-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.2.0"
      }, {
        "fixed" : "4.2.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.cxf:cxf-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.1.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.cxf:cxf-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.6.12"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50645"
  }, {
    "type" : "WEB",
    "url" : "https://cxf.apache.org/security-advisories.data/CVE-2026-50645.txt"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/cxf"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/24zb7cqcvykhwm0j797dmdq25s61mj93"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/06/11/12"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-06T19:12:38Z",
    "nvd_published_at" : "2026-06-12T10:16:23Z"
  }
}

CVSS V3

7.5 HIGH