Improper UTF-8 Decoding in uri-js by Gary Court
CVE-2026-93751

6.9MEDIUM

Key Information:

Vendor

Garycourt

Status
Uri-js
Vendor
CVE Published:
18 September 2026

What is CVE-2026-93751?

The uri-js library, utilized for URI manipulation, is susceptible to an improper UTF-8 decoding vulnerability in the pctDecChars() function. This flaw allows attackers to inject specially crafted percent-encoded payloads that bypass standard decoder validations. Consequently, it may lead to potential path traversal and CRLF injection attacks, as downstream applications could process these payloads without appropriate security measures in place.

Affected Version(s)

uri-js 0 <= 4.4.1

References

https://github.com/garycourt/uri-js/issues/106
issue-tracking
https://github.com/garycourt/uri-js
product
https://github.com/garycourt/uri-js/blob/a1acf730b4bba3f1...
technical-description

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Wayde Shi (PayPal Cyber Security Team)
.