PT-2026-36996 · Npm · Fast-Uri

Kaka + 2 · Published 2026-05-05 · Updated 2026-05-18 · CVE-2026-6322

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions fast-uri versions prior to 3.1.2

Description The normalize() function decoded percent-encoded authority delimiters within the host component and re-emitted them as raw delimiters during serialization. This allows a host combining an allowed domain, an encoded at-sign, and a different domain to be re-emitted with the at-sign as a raw userinfo separator, effectively changing the URI's authority to the second domain. Applications that normalize untrusted URLs before performing host allowlist checks, redirect validation, or outbound request routing can be steered to an authority different from the one specified in the input.

Recommendations Update to version 3.1.2 or later.

Fix

Weakness Enumeration

CWE-436

Related Identifiers

CLEANSTART-2026-BE61221

CLEANSTART-2026-LC05413

CVE-2026-6322

GHSA-V39H-62P7-JPJC

Affected Products

Fast-Uri

References · 215

• https://github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-39408 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4923 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42038 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-39406 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4926 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-29045 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33937 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-41240 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42041 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-41239 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42036 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4800 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-15599 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-30827 · Security Note