CVE-2026-103387: Software Security Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-cw9r-3wqp-32hm
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CVSS 4.3
CWE-248
Published
Advisory Summary

CVE-2026-103387 is a LOW (CVSS 4.3) security vulnerability vulnerability (CWE-248: Uncaught Exception) affecting Software libraries in the Maven ecosystem. The weakness occurs when an exception is thrown from a function, but it is not caught.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-103387 at a Glance

CVE Identifier CVE-2026-103387
GHSA Identifier GHSA-cw9r-3wqp-32hm
Severity LOW
CVSS v3.1 Base Score 4.3
CWE Classification CWE-248: Uncaught Exception
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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

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

How to Fix CVE-2026-103387

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-2026-103387, 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-248: Uncaught Exception, where an exception is thrown from a function, but it is not caught. 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 weakness has been identified in garycourt uri-js up to 4.4.1. This affects the function URI.parse of the file src/schemes/mailto.ts of the component Mailto Header Handler. This manipulation of the argument to causes uncaught exception. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

References

NVD — CVE-2026-103387 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103387
Software Source Repository REPOSITORY
https://github.com/garycourt/uri-js/issues/103
Software Source Repository REPOSITORY
https://github.com/garycourt/uri-js
vuldb.com/cve/cve-2026-103387 WEB
https://vuldb.com/cve/CVE-2026-103387
vuldb.com/submit/956810 WEB
https://vuldb.com/submit/956810
vuldb.com/vuln/412124 WEB
https://vuldb.com/vuln/412124
vuldb.com/vuln/412124/cti WEB
https://vuldb.com/vuln/412124/cti

Frequently Asked Questions

What is CVE-2026-103387?
CVE-2026-103387 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-248: Uncaught Exception.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-103387?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-103387?
CVE-2026-103387 has a CVSS v3.1 base score of 4.3 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2026-103387?
CVE-2026-103387 is classified under CWE-248: Uncaught Exception (An exception is thrown from a function, but it is not caught.).
How can I check Maven dependencies for CVE-2026-103387?
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-cw9r-3wqp-32hm",
  "modified" : "2026-09-30T21:32:10Z",
  "published" : "2026-09-30T21:32:09Z",
  "aliases" : [ "CVE-2026-103387" ],
  "details" : "A weakness has been identified in garycourt uri-js up to 4.4.1. This affects the function URI.parse of the file src/schemes/mailto.ts of the component Mailto Header Handler. This manipulation of the argument to causes uncaught exception. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-103387"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/garycourt/uri-js/issues/103"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/garycourt/uri-js"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-103387"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/956810"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/412124"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/412124/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-248" ],
    "severity" : "LOW",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-30T20:17:30Z"
  }
}