CVE-2026-103387

MEDIUM 4.3

garycourt uri-js Mailto Header mailto.ts URI.parse uncaught exception

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-248
Vendor	garycourt
Product	uri-js
Published	Sep 30, 2026
Last Updated	Sep 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

garycourt / uri-js

4.4.0 4.4.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/412124 vuldb.com: https://vuldb.com/vuln/412124/cti vuldb.com: https://vuldb.com/cve/CVE-2026-103387 vuldb.com: https://vuldb.com/submit/956810 github.com: https://github.com/garycourt/uri-js/issues/103 github.com: https://github.com/garycourt/uri-js/

Credits

🔍 Yu Bao from PayPal Cyber Security Team (VulDB User) VulDB CNA Team