CVE-2026-40208: Software Security Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-2cpw-vgr2-pw3h
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CVSS 3.7
CWE-705
Published
Advisory Summary

CVE-2026-40208 is a LOW (CVSS 3.7) security vulnerability vulnerability (CWE-705: Incorrect Control Flow Scoping) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not properly return control flow to the proper location after it has completed a task or detected an unusual condition.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-40208 at a Glance

CVE Identifier CVE-2026-40208
GHSA Identifier GHSA-2cpw-vgr2-pw3h
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-705: Incorrect Control Flow Scoping
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 3.7

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

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

How to Fix CVE-2026-40208

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-2026-40208, 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-705: Incorrect Control Flow Scoping, where the product does not properly return control flow to the proper location after it has completed a task or detected an unusual condition. 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

An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.

References

NVD — CVE-2026-40208 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40208
Software Security Information SECURITY
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html

Frequently Asked Questions

What is CVE-2026-40208?
CVE-2026-40208 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-705: Incorrect Control Flow Scoping.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-40208?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-40208?
CVE-2026-40208 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2026-40208?
CVE-2026-40208 is classified under CWE-705: Incorrect Control Flow Scoping (The product does not properly return control flow to the proper location after it has completed a task or detected an unusual condition.).
How can I check Maven dependencies for CVE-2026-40208?
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-2cpw-vgr2-pw3h",
  "modified" : "2026-06-25T15:31:59Z",
  "published" : "2026-06-25T15:31:59Z",
  "aliases" : [ "CVE-2026-40208" ],
  "details" : "An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40208"
  }, {
    "type" : "WEB",
    "url" : "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-705" ],
    "severity" : "LOW",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-25T13:16:39Z"
  }
}