Interpretation Conflict in fast-uri - CVE-2026-110180
Published: November 10, 2026
Vulnerability identifier: #VU164381
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-110180
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass host-based policies and steer traffic to unintended destinations.
The vulnerability exists due to an interpretation conflict in fast-uri's canonicalizeHost() when adopting the WHATWG parser's hostname without verifying that the entire input was interpreted as a host. A remote attacker can supply URLs such as http://a@b@evil.example/ or hosts containing TAB, CR, or LF to trigger host rewriting and bypass applications' policies when checks and subsequent use rely on different host representations.
Affected software
fast-uri
ApplinX
ApplinX
How to mitigate CVE-2026-110180
Install security update from vendor's website.
fast-uri - addressed in versions 2.4.8, 3.1.9, 4.2.3