---
id: CVE-2026-103387
title: A weakness has been identified in garycourt uri-js up to 4.4.1
summary: >-
  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.…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cwe:
  - CWE-248
vendor: garycourt
product: uri-js
affected:
  - uri-js 4.4.0
  - uri-js 4.4.1
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T20:17:30.620'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103387'
references:
  - url: 'https://github.com/garycourt/uri-js/'
    label: cna@vuldb.com
  - url: 'https://github.com/garycourt/uri-js/issues/103'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-103387'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/956810'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/412124'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/412124/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T19:54:52.854537Z'
ingestedAt: '2026-09-30T20:23:19.515Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.