CVE-2026-93751

MEDIUM 6.5

uri-js through 4.4.1 Improper UTF-8 Decoding via pctDecChars

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

uri-js through 4.4.1 contains an improper UTF-8 decoding vulnerability in pctDecChars() that decodes invalid and overlong percent-encoded sequences into ASCII metacharacters. Attackers can craft percent-encoded payloads to bypass platform decoder validation and inject path traversal or CRLF sequences that downstream consumers process without filtering.

CWE	CWE-176
Vendor	garycourt
Product	uri-js
Published	Sep 18, 2026

Stay Ahead of the Next One

Get instant alerts for garycourt uri-js

Be the first to know when new medium vulnerabilities affecting garycourt uri-js are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

garycourt / uri-js

0 ≤ 4.4.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/garycourt/uri-js/issues/106 github.com: https://github.com/garycourt/uri-js github.com: https://github.com/garycourt/uri-js/blob/a1acf730b4bba3f1097c9f52e7d9d3aba8cdcaae/src/uri.ts#L103-L141 vulncheck.com: https://www.vulncheck.com/advisories/uri-js-through-4.4.1-improper-utf-8-decoding-via-pctdecchars

Credits

🔍 Wayde Shi (PayPal Cyber Security Team)