CVE-2026-93751
uri-js through 4.4.1 Improper UTF-8 Decoding via pctDecChars
- State
- Published
- Severity
- 6.9 Medium
- Published
- Sep 18, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 18, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-176 Improper Handling of Unicode Encoding
Affected Products
| Product | Versions |
|---|---|
uri-jsgarycourt |
|
References
- GitHub Issue #106issue-tracking
- https://github.com/garycourt/uri-jsproduct
- pctDecChars() masking bytes without continuation-byte validationtechnical-description
- VulnCheck Advisory: uri-js through 4.4.1 Improper UTF-8 Decoding via pctDecCharsthird-party-advisory
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