CVE-2026-93751Public exploitNetwork attack vectorHinoki check available

Path traversal and CRLF injection via malformed UTF-8

Published Sep 18, 2026 · Updated Sep 18, 2026

Improper UTF-8 decoding in URI.js 4.4.1 and earlier allows remote attackers to inject path traversal or CRLF sequences. The pctDecChars() decoder masks bytes without validating continuation bytes or rejecting overlong encodings, turning malformed percent encodings into ASCII metacharacters. Exploitation requires an application to validate untrusted URI data with a standard decoder, then process it with unescapeComponent or parse and trust the second decoded value in a path or downstream protocol.

CVSS severity6.9
Medium
EPSS probability0.40%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper UTF-8 decoding in URI.js 4.4.1 and earlier allows remote attackers to inject path traversal or CRLF sequences. The pctDecChars() decoder masks bytes without validating continuation bytes or rejecting overlong encodings, turning malformed percent encodings into ASCII metacharacters. Exploitation requires an application to validate untrusted URI data with a standard decoder, then process it with unescapeComponent or parse and trust the second decoded value in a path or downstream protocol.

The record

CVE
CVE-2026-93751
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Gary Court
Product
URI.js
Classifications
CWE-176
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gary Court · URI.jsversion=0 <=4.4.1

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-176Improper Handling of Unicode Encoding

Public exploit references

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Technologies

Your stack

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Your stack

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