CVE-2026-43491: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-vfqf-4c37-r857
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CVSS 5.5
Published
Advisory Summary

CVE-2026-43491 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43491 at a Glance

CVE Identifier CVE-2026-43491
GHSA Identifier GHSA-vfqf-4c37-r857
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

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

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

How to Fix CVE-2026-43491

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-2026-43491, 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 General Security Weakness. 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 the Linux kernel, the following vulnerability has been resolved: net: qrtr: ns: Limit the maximum server registration per node Current code does no bound checking on the number of servers added per node. A malicious client can flood NEW_SERVER messages and exhaust memory. Fix this issue by limiting the maximum number of server registrations to 256 per node. If the NEW_SERVER message is received for an old port, then don't restrict it as it will get replaced. While at it, also rate limit the error messages in the failure path of qrtr_ns_worker(). Note that the limit of 256 is chosen based on the current platform requirements. If requirement changes in the future, this limit can be increased.

References

NVD — CVE-2026-43491 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43491
git.kernel.org/stable/c/35fb4a0c07... WEB
https://git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d
git.kernel.org/stable/c/3efaad55ca... WEB
https://git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b
git.kernel.org/stable/c/868202aa2a... WEB
https://git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c
git.kernel.org/stable/c/94914731ca... WEB
https://git.kernel.org/stable/c/94914731ca0b99899dceadd80d2df00584a688ca
git.kernel.org/stable/c/991c431077... WEB
https://git.kernel.org/stable/c/991c431077b19176d3fe3bb54054c063776a8cdc
git.kernel.org/stable/c/b48fc702b2... WEB
https://git.kernel.org/stable/c/b48fc702b20233b809f01053232c3cd5083c97b4
git.kernel.org/stable/c/d5ee2ff983... WEB
https://git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955
git.kernel.org/stable/c/e6f6cd501f... WEB
https://git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7

Frequently Asked Questions

What is CVE-2026-43491?
CVE-2026-43491 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43491?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43491?
CVE-2026-43491 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-43491?
CVE-2026-43491 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-43491?
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-vfqf-4c37-r857",
  "modified" : "2026-08-19T18:31:57Z",
  "published" : "2026-05-19T12:31:41Z",
  "aliases" : [ "CVE-2026-43491" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: ns: Limit the maximum server registration per node\n\nCurrent code does no bound checking on the number of servers added per\nnode. A malicious client can flood NEW_SERVER messages and exhaust memory.\n\nFix this issue by limiting the maximum number of server registrations to\n256 per node. If the NEW_SERVER message is received for an old port, then\ndon't restrict it as it will get replaced. While at it, also rate limit\nthe error messages in the failure path of qrtr_ns_worker().\n\nNote that the limit of 256 is chosen based on the current platform\nrequirements. If requirement changes in the future, this limit can be\nincreased.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43491"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/94914731ca0b99899dceadd80d2df00584a688ca"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/991c431077b19176d3fe3bb54054c063776a8cdc"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b48fc702b20233b809f01053232c3cd5083c97b4"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-19T12:16:18Z"
  }
}