CVE-2026-73631: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-gvf6-rf7m-9h3g
Share
CVSS 4.3
CWE-567
Published
Advisory Summary

CVE-2026-73631 is a MODERATE (CVSS 4.3) security vulnerability vulnerability (CWE-567: Unsynchronized Access to Shared Data in a Multithreaded Context) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not properly synchronize shared data, such as static variables across threads, which can lead to undefined behavior and unpredictable data changes.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-73631 at a Glance

CVE Identifier CVE-2026-73631
GHSA Identifier GHSA-gvf6-rf7m-9h3g
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-567: Unsynchronized Access to Shared Data in a Multithreaded Context
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-73631

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

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

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-73631, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

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

Note: The mvn dependency:tree 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-567: Unsynchronized Access to Shared Data in a Multithreaded Context, where the product does not properly synchronize shared data, such as static variables across threads, which can lead to undefined behavior and unpredictable data changes. In Software, 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

Exposure of data element to wrong session vulnerability in the JSON plugin of Apache Struts. Per-request parsing state could be shared across concurrent requests, allowing data associated with one request to become observable in another, and configured parsing limits not to be enforced as intended. Populating actions from a JSON request body is not enabled by default; applications that do not use the JSON plugin are not affected. This issue affects Apache Struts: 7.2.1. Users are recommended to upgrade to version 7.3.0, which fixes the issue.

References

NVD — CVE-2026-73631 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73631
cwiki.apache.org/confluence/display/... WEB
https://cwiki.apache.org/confluence/display/WW/S2-070

Frequently Asked Questions

What is CVE-2026-73631?
CVE-2026-73631 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-567: Unsynchronized Access to Shared Data in a Multithreaded Context.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-73631?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-73631?
CVE-2026-73631 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-73631?
CVE-2026-73631 is classified under CWE-567: Unsynchronized Access to Shared Data in a Multithreaded Context (The product does not properly synchronize shared data, such as static variables across threads, which can lead to undefined behavior and unpredictable data changes.).
How can I check Maven dependencies for CVE-2026-73631?
Run the dependency tree command: 'mvn dependency:tree'. 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-gvf6-rf7m-9h3g",
  "modified" : "2026-08-17T15:30:38Z",
  "published" : "2026-08-15T12:30:19Z",
  "aliases" : [ "CVE-2026-73631" ],
  "details" : "Exposure of data element to wrong session vulnerability in the JSON plugin of Apache Struts. Per-request parsing state could be shared across concurrent requests, allowing data associated with one request to become observable in another, and configured parsing limits not to be enforced as intended. Populating actions from a JSON request body is not enabled by default; applications that do not use the JSON plugin are not affected.\n\nThis issue affects Apache Struts: 7.2.1.\n\nUsers are recommended to upgrade to version 7.3.0, which fixes the issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-73631"
  }, {
    "type" : "WEB",
    "url" : "https://cwiki.apache.org/confluence/display/WW/S2-070"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-567" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-15T11:16:27Z"
  }
}