---
id: CVE-2026-93751
title: >-
  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
summary: >-
  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
  platfor…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-176
vendor: garycourt
product: uri-js
affected:
  - uri-js <= 4.4.1
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:25:55.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93751'
references:
  - url: 'https://github.com/garycourt/uri-js'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/garycourt/uri-js/blob/a1acf730b4bba3f1097c9f52e7d9d3aba8cdcaae/src/uri.ts#L103-L141
    label: disclosure@vulncheck.com
  - url: 'https://github.com/garycourt/uri-js/issues/106'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/uri-js-through-4.4.1-improper-utf-8-decoding-via-pctdecchars
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00233
epssPercentile: 0.14467
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T16:28:54.072164Z'
ingestedAt: '2026-09-18T18:47:53.269Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.