CVE-2026-4786: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-cccx-m78h-m3xw
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CVSS 7.1
CWE-88 CWE-77
Published
Advisory Summary

CVE-2026-4786 is a HIGH (CVSS 7.1) security vulnerability vulnerability (CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-4786 at a Glance

CVE Identifier CVE-2026-4786
GHSA Identifier GHSA-cccx-m78h-m3xw
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.1

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

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

How to Fix CVE-2026-4786

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-2026-4786, 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-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection'), where the product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. 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

Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

References

NVD — CVE-2026-4786 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4786
Software Source Repository REPOSITORY
https://github.com/python/cpython/issues/148169
Software Source Repository REPOSITORY
https://github.com/python/cpython/pull/148170
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/a4d3edf3a6ecfde504d02126410d2a65a859b744
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53
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Software Security Information SECURITY
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bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2458049
Software Security Information SECURITY
https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5
Software Security Information SECURITY
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Frequently Asked Questions

What is CVE-2026-4786?
CVE-2026-4786 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection').
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-4786?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-4786?
CVE-2026-4786 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L.
What CWE is associated with CVE-2026-4786?
CVE-2026-4786 is classified under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') (The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.).
How can I check Maven dependencies for CVE-2026-4786?
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 
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