CVE-2026-4687: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-gw7x-g9xx-wmm2
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CVSS 8.6
CWE-120 CWE-501 CWE-754
Published
Advisory Summary

CVE-2026-4687 is a HIGH (CVSS 8.6) security vulnerability vulnerability (CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-4687 at a Glance

CVE Identifier CVE-2026-4687
GHSA Identifier GHSA-gw7x-g9xx-wmm2
Severity HIGH
CVSS v3.1 Base Score 8.6
CWE Classification CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.6

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

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

How to Fix CVE-2026-4687

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-2026-4687, 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-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), where the product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. 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

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9.

References

NVD — CVE-2026-4687 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4687
access.redhat.com/errata/rhsa-2026:59... WEB
https://access.redhat.com/errata/RHSA-2026:5930
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:8287
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:8288
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:8289
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:8290
access.redhat.com/errata/rhsa-2026:83... WEB
https://access.redhat.com/errata/RHSA-2026:8315
access.redhat.com/errata/rhsa-2026:84... WEB
https://access.redhat.com/errata/RHSA-2026:8427
access.redhat.com/errata/rhsa-2026:88... WEB
https://access.redhat.com/errata/RHSA-2026:8850
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-4687
bugzilla.mozilla.org/show_bug.cgi WEB
https://bugzilla.mozilla.org/show_bug.cgi?id=2016368
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2450757
Software Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4687.json
Software Security Information SECURITY
https://www.mozilla.org/security/advisories/mfsa2026-20
Software Security Information SECURITY
https://www.mozilla.org/security/advisories/mfsa2026-21
Software Security Information SECURITY
https://www.mozilla.org/security/advisories/mfsa2026-22
Software Security Information SECURITY
https://www.mozilla.org/security/advisories/mfsa2026-23
Software Security Information SECURITY
https://www.mozilla.org/security/advisories/mfsa2026-24
access.redhat.com/errata/rhsa-2026:59... WEB
https://access.redhat.com/errata/RHSA-2026:5931
access.redhat.com/errata/rhsa-2026:59... WEB
https://access.redhat.com/errata/RHSA-2026:5932
access.redhat.com/errata/rhsa-2026:61... WEB
https://access.redhat.com/errata/RHSA-2026:6188
access.redhat.com/errata/rhsa-2026:63... WEB
https://access.redhat.com/errata/RHSA-2026:6342
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:6917
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7837
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7838
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7839
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7840
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7841
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7842
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7843
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7845
access.redhat.com/errata/rhsa-2026:78... WEB
https://access.redhat.com/errata/RHSA-2026:7858
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:8284
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:8285
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:8286

Frequently Asked Questions

What is CVE-2026-4687?
CVE-2026-4687 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow').
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-4687?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-4687?
CVE-2026-4687 has a CVSS v3.1 base score of 8.6 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
What CWE is associated with CVE-2026-4687?
CVE-2026-4687 is classified under CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') (The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.).
How can I check Maven dependencies for CVE-2026-4687?
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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