CVE-2026-6645: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-7rjc-r662-4qm8
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CWE-427
Published
Advisory Summary

CVE-2026-6645 is a HIGH security vulnerability vulnerability (CWE-427: Uncontrolled Search Path Element) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-6645 at a Glance

CVE Identifier CVE-2026-6645
GHSA Identifier GHSA-7rjc-r662-4qm8
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-427: Uncontrolled Search Path Element
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-6645

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-2026-6645, 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-427: Uncontrolled Search Path Element, where the product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. 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

An insecure process execution vulnerability exists in the pc-printer-updater.exe component of the PaperCut Print Deploy Client for Windows. The application, which typically operates with high-level system privileges, attempts to perform an internal validation check by invoking a secondary system utility using an unqualified file reference. Because the application does not specify an absolute path to this utility, it relies on the operating system's default search order to locate the executable. Under specific conditions, a local attacker with the ability to modify directories within the system's search path could plant a malicious binary that mimics the expected utility. This could result in the malicious code being executed with SYSTEM privileges, leading to a full compromise of the affected host.

References

NVD — CVE-2026-6645 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6645
Software Security Information SECURITY
https://www.papercut.com/kb/Main/papercut-ng-mf-security-bulletin-june-2026

Frequently Asked Questions

What is CVE-2026-6645?
CVE-2026-6645 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-427: Uncontrolled Search Path Element.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-6645?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-6645?
CVE-2026-6645 is classified under CWE-427: Uncontrolled Search Path Element (The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors.).
How can I check Maven dependencies for CVE-2026-6645?
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-7rjc-r662-4qm8",
  "modified" : "2026-06-22T09:30:45Z",
  "published" : "2026-06-22T09:30:44Z",
  "aliases" : [ "CVE-2026-6645" ],
  "details" : "An insecure process execution vulnerability exists in the pc-printer-updater.exe component of the PaperCut Print Deploy Client for Windows. The application, which typically operates with high-level system privileges, attempts to perform an internal validation check by invoking a secondary system utility using an unqualified file reference.\n\n\n\nBecause the application does not specify an absolute path to this utility, it relies on the operating system's default search order to locate the executable. Under specific conditions, a local attacker with the ability to modify directories within the system's search path could plant a malicious binary that mimics the expected utility. This could result in the malicious code being executed with SYSTEM privileges, leading to a full compromise of the affected host.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/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-2026-6645"
  }, {
    "type" : "WEB",
    "url" : "https://www.papercut.com/kb/Main/papercut-ng-mf-security-bulletin-june-2026"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-427" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-22T04:17:13Z"
  }
}