CVE-2026-100351
Description
A flaw was found in kin-openapi. An unauthenticated remote attacker can bypass authentication checks on protected routes by sending requests containing encoded path separators. This issue occurs because the request validation handler inspects the decoded URL path, while certain downstream routers dispatch requests using the raw encoded path. As a result, a request can be mistakenly treated as public and forwarded to a protected handler without required authentication.
Statement
This vulnerability is rated as Important because an unauthenticated remote attacker can bypass authentication enforcement and reach protected API handlers, potentially compromising data confidentiality and integrity. Exploitation requires specific architectural preconditions, including downstream routers configured to preserve encoded paths alongside overlapping public and parameterized endpoints. In typical deployments where reverse proxies normalize or canonicalize request paths before forwarding, or where handlers perform independent access control checks, exposure is substantially curtailed.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.4 | N/A | 7.4 |
| 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 | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
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