CVE-2026-118681
Description
A flaw was found in chi. An unauthenticated remote attacker can access sensitive information by bypassing authentication controls when the SuppressNotFound middleware is used. Due to improper handling of routing context, requests to a mounted path can be dispatched against outer routes while retaining route parameters and skipping authentication middleware. This vulnerability allows unauthorized attackers to retrieve restricted tenant-scoped data.
Statement
This vulnerability is rated with a Low impact because triggering the flaw requires an unusual router topology that combines the SuppressNotFound middleware with overlapping sub-router and top-level URL paths. In typical Red Hat deployments incorporating this library, services do not implement this specific routing pattern or rely on tainted route parameters across handler boundaries. Consequently, the practical risk to supported Red Hat offerings remains minimal under standard configurations.
Mitigation
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | 3.7 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | None | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
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