CVE-2026-86143: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-r2q6-6v35-773j
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CVSS 6.9
CWE-192
Published
Advisory Summary

CVE-2026-86143 is a MODERATE (CVSS 6.9) security vulnerability vulnerability (CWE-192: Integer Coercion Error) affecting Software libraries in the Maven ecosystem. The weakness occurs when integer coercion refers to a set of flaws pertaining to the type casting, extension, or truncation of primitive data types.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-86143 at a Glance

CVE Identifier CVE-2026-86143
GHSA Identifier GHSA-r2q6-6v35-773j
Severity MODERATE
CVSS v3.1 Base Score 6.9
CWE Classification CWE-192: Integer Coercion Error
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.9

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

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

How to Fix CVE-2026-86143

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-2026-86143, 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-192: Integer Coercion Error, where integer coercion refers to a set of flaws pertaining to the type casting, extension, or truncation of primitive data types. 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

In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.

References

NVD — CVE-2026-86143 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86143
Security Fix Commit FIX COMMIT
https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35
Software Source Repository REPOSITORY
https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4
gitlab.gnome.org/gnome/libxml2/-/wor... WEB
https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111

Frequently Asked Questions

What is CVE-2026-86143?
CVE-2026-86143 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-192: Integer Coercion Error.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-86143?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-86143?
CVE-2026-86143 has a CVSS v3.1 base score of 6.9 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L.
What CWE is associated with CVE-2026-86143?
CVE-2026-86143 is classified under CWE-192: Integer Coercion Error (Integer coercion refers to a set of flaws pertaining to the type casting, extension, or truncation of primitive data types.).
How can I check Maven dependencies for CVE-2026-86143?
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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  "schema_version" : "1.4.0",
  "id" : "GHSA-r2q6-6v35-773j",
  "modified" : "2026-09-05T06:32:37Z",
  "published" : "2026-09-05T06:32:37Z",
  "aliases" : [ "CVE-2026-86143" ],
  "details" : "In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-86143"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4"
  }, {
    "type" : "WEB",
    "url" : "https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-192" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-05T05:17:13Z"
  }
}