CVE-2026-104380: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-cmh9-2wr3-4x64
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CVSS 5.3
CWE-1385
Published
Advisory Summary

CVE-2026-104380 is a MODERATE (CVSS 5.3) security vulnerability vulnerability (CWE-1385: Missing Origin Validation in WebSockets) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses a websocket, but it does not properly verify that the source of data or communication is valid.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-104380 at a Glance

CVE Identifier CVE-2026-104380
GHSA Identifier GHSA-cmh9-2wr3-4x64
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-1385: Missing Origin Validation in WebSockets
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:U/C:L/I:N/A:N).

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

How to Fix CVE-2026-104380

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-2026-104380, 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-1385: Missing Origin Validation in WebSockets, where the product uses a websocket, but it does not properly verify that the source of data or communication is valid. 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

Punk versions from 0.48 before 0.55 for Perl route Extended CONNECT requests to any GET route without an Origin check in ps_serve_one. On HTTP/2 and HTTP/3 a WebSocket handshake arrives as an Extended CONNECT, which is matched as a GET and so reaches every GET route, API operation and mount. The Origin check runs only when a websocket route matches. On this transport the handler's status is the handshake response, and a 2xx accepts it. A cross-origin page can open a WebSocket to any path and learn from its open or error event whether that path returns 2xx.

References

NVD — CVE-2026-104380 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104380
metacpan.org/release/lnation/pun... WEB
https://metacpan.org/release/LNATION/Punk-0.55/changes
metacpan.org/release/lnation/pun... WEB
https://metacpan.org/release/LNATION/Punk-0.55/diff/LNATION/Punk-0.54
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/10/06/1

Frequently Asked Questions

What is CVE-2026-104380?
CVE-2026-104380 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-1385: Missing Origin Validation in WebSockets.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-104380?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-104380?
CVE-2026-104380 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-104380?
CVE-2026-104380 is classified under CWE-1385: Missing Origin Validation in WebSockets (The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.).
How can I check Maven dependencies for CVE-2026-104380?
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-cmh9-2wr3-4x64",
  "modified" : "2026-10-06T15:31:49Z",
  "published" : "2026-10-06T03:31:20Z",
  "aliases" : [ "CVE-2026-104380" ],
  "details" : "Punk versions from 0.48 before 0.55 for Perl route Extended CONNECT requests to any GET route without an Origin check in ps_serve_one.\n\nOn HTTP/2 and HTTP/3 a WebSocket handshake arrives as an Extended CONNECT, which is matched as a GET and so reaches every GET route, API operation and mount. The Origin check runs only when a websocket route matches. On this transport the handler's status is the handshake response, and a 2xx accepts it.\n\nA cross-origin page can open a WebSocket to any path and learn from its open or error event whether that path returns 2xx.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-104380"
  }, {
    "type" : "WEB",
    "url" : "https://metacpan.org/release/LNATION/Punk-0.55/changes"
  }, {
    "type" : "WEB",
    "url" : "https://metacpan.org/release/LNATION/Punk-0.55/diff/LNATION/Punk-0.54"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/10/06/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1385" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-06T02:17:03Z"
  }
}