SB2026072226 - Interpretation Conflict in fast-uri

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Main Vulnerability Database SB2026072226

SB2026072226 - Interpretation Conflict in fast-uri

Published: July 22, 2026

Security Bulletin ID SB2026072226
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Interpretation Conflict (CVE-ID: CVE-2026-16221)

CWE-ID: CWE-436 - Interpretation Conflict

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to bypass host-based policy checks and route requests to an unintended destination.

The vulnerability exists due to interpretation conflict in the fast-uri URL parser when parsing URLs containing a literal backslash in the authority section for special schemes. A remote attacker can supply a specially crafted URL to bypass host-based policy checks and route requests to an unintended destination.

This issue can occur when an application validates a URL with fast-uri and then passes the same input to Node's WHATWG URL parser or fetch-related consumers, which extract a different host from the same string.


Remediation

Install update from vendor's website.

References