Vulnerability in Garycourt Uri-Js
CVE-2026-93751
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/garycourt/uri-js/issues/106 (issue-tracking)
- github.com/garycourt/uri-js (product)
- github.com/garycourt/uri-js/blob/a1acf730b4bba3f1097c9f52e7d9d3aba8cdcaae/src/u… (technical-description)
- www.vulncheck.com/advisories/uri-js-through-4.4.1-improper-utf-8-decoding-via-p… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93751?
- CVE-2026-93751 is a medium-severity vulnerability in Garycourt Uri-Js, classified under CWE-176. CVSS score: 6.5/10. Published 2026-09-18.
- How severe is CVE-2026-93751?
- Medium severity. CVSS v3 base score is 6.5 out of 10.