CVE-2026-18397: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-cq27-3937-pqqv
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CWE-130
Published
Advisory Summary

CVE-2026-18397 is a CRITICAL security vulnerability vulnerability (CWE-130: Improper Handling of Length Parameter Inconsistency) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-18397 at a Glance

CVE Identifier CVE-2026-18397
GHSA Identifier GHSA-cq27-3937-pqqv
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-130: Improper Handling of Length Parameter Inconsistency
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-18397

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-2026-18397, 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-130: Improper Handling of Length Parameter Inconsistency, where the product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data. 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

This vulnerability enables unauthenticated remote code execution (RCE) on a victim's machine by exploiting a combination of cryptographic weaknesses and memory management issues in the SConnect native host component. The attack leverages an unrestricted messaging interface between an attacker-controlled web page and the native host, allowing malicious input to bypass security checks.

References

NVD — CVE-2026-18397 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18397
Software Security Information SECURITY
https://www.thalesgroup.com/en/product-security-incident-response

Frequently Asked Questions

What is CVE-2026-18397?
CVE-2026-18397 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-130: Improper Handling of Length Parameter Inconsistency.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-18397?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-18397?
CVE-2026-18397 is classified under CWE-130: Improper Handling of Length Parameter Inconsistency (The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.).
How can I check Maven dependencies for CVE-2026-18397?
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-cq27-3937-pqqv",
  "modified" : "2026-10-02T00:31:30Z",
  "published" : "2026-10-02T00:31:29Z",
  "aliases" : [ "CVE-2026-18397" ],
  "details" : "This vulnerability enables unauthenticated remote code execution (RCE) on a victim's machine by exploiting a combination of cryptographic weaknesses and memory management issues in the SConnect native host component.\n\nThe attack leverages an unrestricted messaging interface between an attacker-controlled web page and the native host, allowing malicious input to bypass security checks.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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-2026-18397"
  }, {
    "type" : "WEB",
    "url" : "https://www.thalesgroup.com/en/product-security-incident-response"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-130" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-01T22:17:01Z"
  }
}