CVE-2026-23556: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-qcp2-2xf6-hw26
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CWE-281
Published
Advisory Summary

CVE-2026-23556 is a CRITICAL security vulnerability vulnerability (CWE-281: Improper Preservation of Permissions) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-23556 at a Glance

CVE Identifier CVE-2026-23556
GHSA Identifier GHSA-qcp2-2xf6-hw26
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-281: Improper Preservation of Permissions
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-23556

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-2026-23556, 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-281: Improper Preservation of Permissions, where the product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended. 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

When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are leaked. When the domain ID is eventually reused, the new domain can create fewer nodes before beeing deemed to be over quota.

References

NVD — CVE-2026-23556 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23556
xenbits.xen.org/xsa/advisory-483.ht... WEB
https://xenbits.xen.org/xsa/advisory-483.html
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/04/28/10
xenbits.xen.org/xsa/advisory-483.ht... WEB
http://xenbits.xen.org/xsa/advisory-483.html

Frequently Asked Questions

What is CVE-2026-23556?
CVE-2026-23556 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-281: Improper Preservation of Permissions.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-23556?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-23556?
CVE-2026-23556 is classified under CWE-281: Improper Preservation of Permissions (The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.).
How can I check Maven dependencies for CVE-2026-23556?
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-qcp2-2xf6-hw26",
  "modified" : "2026-07-09T18:31:50Z",
  "published" : "2026-07-09T18:31:50Z",
  "aliases" : [ "CVE-2026-23556" ],
  "details" : "When oxenstored is tearing a domain down, the node data is cleaned up\nbut the usage counts are leaked.\n\nWhen the domain ID is eventually reused, the new domain can create fewer\nnodes before beeing deemed to be over quota.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-23556"
  }, {
    "type" : "WEB",
    "url" : "https://xenbits.xen.org/xsa/advisory-483.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/04/28/10"
  }, {
    "type" : "WEB",
    "url" : "http://xenbits.xen.org/xsa/advisory-483.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-281" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-09T16:16:38Z"
  }
}