CVE-2026-84292

A flaw was found in fast-uri. This component improperly serializes the port component of a Uniform Resource Identifier (URI) without validating its content. A remote attacker can exploit this by crafting a malicious port value that injects authority delimiters. This manipulation can demote the intended host to user information and redirect the authority to an attacker-controlled host, leading to information disclosure as applications interpret the attacker's host as legitimate.

This is an Important flaw. Applications utilizing the fast-uri library in Red Hat environments are susceptible to authority injection if they process untrusted data as the port component of a URI. This could allow an attacker to redirect network traffic to an arbitrary host, compromising communication integrity.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.