Vulnerability in Garycourt Uri-Js
CVE-2026-103387
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Garycourt Uri-Js — versions 4.4.0, 4.4.1
Weakness classification (CWE)
References
- vuldb.com/vuln/412124 (technical-description, vdb-entry)
- vuldb.com/vuln/412124/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-103387 (third-party-advisory)
- vuldb.com/submit/956810 (third-party-advisory)
- github.com/garycourt/uri-js/issues/103 (issue-tracking, exploit)
- github.com/garycourt/uri-js/ (product)
Frequently asked questions
- What is CVE-2026-103387?
- CVE-2026-103387 is a medium-severity vulnerability in Garycourt Uri-Js, classified under CWE-248. CVSS score: 4.3/10. Published 2026-09-30.
- How severe is CVE-2026-103387?
- Medium severity. CVSS v3 base score is 4.3 out of 10.