CVE-2026-20349: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-8x4j-5v9x-9frv
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CVSS 8.6
CWE-244
Published
Advisory Summary

CVE-2026-20349 is a HIGH (CVSS 8.6) security vulnerability vulnerability (CWE-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection')) affecting Software libraries in the Maven ecosystem. The weakness occurs when using realloc() to resize buffers that store sensitive information can leave the sensitive information exposed to attack, because it is not removed from memory.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-20349 at a Glance

CVE Identifier CVE-2026-20349
GHSA Identifier GHSA-8x4j-5v9x-9frv
Severity HIGH
CVSS v3.1 Base Score 8.6
CWE Classification CWE-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection')
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-2026-20349

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-2026-20349, 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-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection'), where using realloc() to resize buffers that store sensitive information can leave the sensitive information exposed to attack, because it is not removed from memory. 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

A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.  This vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

References

NVD — CVE-2026-20349 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20349
Software Security Information SECURITY
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF
www.cisa.gov/known-exploited-vul... WEB
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349

Frequently Asked Questions

What is CVE-2026-20349?
CVE-2026-20349 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection').
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-20349?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-20349?
CVE-2026-20349 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-2026-20349?
CVE-2026-20349 is classified under CWE-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection') (Using realloc() to resize buffers that store sensitive information can leave the sensitive information exposed to attack, because it is not removed from memory.).
How can I check Maven dependencies for CVE-2026-20349?
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-8x4j-5v9x-9frv",
  "modified" : "2026-08-11T21:32:37Z",
  "published" : "2026-08-11T18:30:51Z",
  "aliases" : [ "CVE-2026-20349" ],
  "details" : "A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. \n\nThis vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-20349"
  }, {
    "type" : "WEB",
    "url" : "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF"
  }, {
    "type" : "WEB",
    "url" : "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-244" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-11T17:17:48Z"
  }
}