CVE-2026-82964: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-r5c7-vpw8-xf4v
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CVSS 8.8
CWE-281
Published
Advisory Summary

CVE-2026-82964 is a HIGH (CVSS 8.8) 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-2026-82964 at a Glance

CVE Identifier CVE-2026-82964
GHSA Identifier GHSA-r5c7-vpw8-xf4v
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-281: Improper Preservation of Permissions
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-82964

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-2026-82964, 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

Improper preservation of permissions in the Avast sandbox minifilter driver (aswSnx.sys) on Windows allows a local, low-privileged attacker executing inside the sandbox to escape file isolation and escalate to SYSTEM. When the sandbox virtualizes a file it copies the original security descriptor, but the driver opened the virtualization target object with GENERIC_WRITE and FILE_WRITE_ATTRIBUTES only, omitting WRITE_DAC. Every attempt to apply the original DACL therefore failed, and the failure was discarded silently, leaving virtualized copies of sensitive files with permissive permissions. Because the IRP_MJ_CREATE callback additionally did not strip WRITE_DAC for sensitive directories, a sandboxed process could rewrite the security descriptor of a virtualized object, read the virtualized copy of the SAM database, extract local NTLM password hashes and execute code as SYSTEM. The absence of an IRP_MJ_SET_SECURITY callback in the driver's operation registration table is a related defense-in-depth gap, but it is not the control that prevents this attack.

References

NVD — CVE-2026-82964 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82964
Software Source Repository REPOSITORY
https://github.com/MSNightmare/PrettyPrague
support.avast.com/en-us/article/updat... WEB
https://support.avast.com/en-us/article/Update-Antivirus
support.avg.com/supportarticleview WEB
https://support.avg.com/SupportArticleView?l=en&urlname=Update-AVG-Antivirus
support.norton.com/sp/en/us/home/curre... WEB
https://support.norton.com/sp/en/us/home/current/solutions/v20240108175512167
Software Security Information SECURITY
https://www.gendigital.com/us/en/contact-us/security-advisories
x.com/msnightmare2000/sta... WEB
https://x.com/msnightmare2000/status/2094106041046765752

Frequently Asked Questions

What is CVE-2026-82964?
CVE-2026-82964 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-2026-82964?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-82964?
CVE-2026-82964 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-82964?
CVE-2026-82964 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-2026-82964?
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-r5c7-vpw8-xf4v",
  "modified" : "2026-09-16T15:31:13Z",
  "published" : "2026-09-16T15:31:13Z",
  "aliases" : [ "CVE-2026-82964" ],
  "details" : "Improper preservation of permissions in the Avast sandbox minifilter driver (aswSnx.sys) on Windows allows a local, low-privileged attacker executing inside the sandbox to escape file isolation and escalate to SYSTEM.\n\n\n\nWhen the sandbox virtualizes a file it copies the original security descriptor, but the driver opened the virtualization target object with GENERIC_WRITE and FILE_WRITE_ATTRIBUTES only, omitting WRITE_DAC. Every attempt to apply the original DACL therefore failed, and the failure was discarded silently, leaving virtualized copies of sensitive files with permissive permissions. Because the IRP_MJ_CREATE callback additionally did not strip WRITE_DAC for sensitive directories, a sandboxed process could rewrite the security descriptor of a virtualized object, read the virtualized copy of the SAM database, extract local NTLM password hashes and execute code as SYSTEM.\n\n\n\nThe absence of an IRP_MJ_SET_SECURITY callback in the driver's operation registration table is a related defense-in-depth gap, but it is not the control that prevents this attack.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-82964"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/MSNightmare/PrettyPrague"
  }, {
    "type" : "WEB",
    "url" : "https://support.avast.com/en-us/article/Update-Antivirus"
  }, {
    "type" : "WEB",
    "url" : "https://support.avg.com/SupportArticleView?l=en&urlname=Update-AVG-Antivirus"
  }, {
    "type" : "WEB",
    "url" : "https://support.norton.com/sp/en/us/home/current/solutions/v20240108175512167"
  }, {
    "type" : "WEB",
    "url" : "https://www.gendigital.com/us/en/contact-us/security-advisories"
  }, {
    "type" : "WEB",
    "url" : "https://x.com/msnightmare2000/status/2094106041046765752"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-281" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T15:17:55Z"
  }
}