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CVE-2026-73501— kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default

Quick assessment

Affected
getkin kin-openapi
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

getkin kin-openapi是getkin组织开源的一个 Go 的 OpenAPI 3.0 实现。 getkin kin-openapi 0.144.0之前版本存在授权问题漏洞，该漏洞源于ValidationHandler.Load()将nil AuthenticationFunc静默替换为NoopAuthenticationFunc，导致未认证请求满足所有OpenAPI安全要求，可能绕过身份验证并访问受保护资源。

CVSS 9.1 · Critical EPSS 0.59% · P47

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
getkin kin-openapi < 0.144.0 affected
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I. Basic Information for CVE-2026-73501

Vulnerability Information
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Vulnerability Title
kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default
Source: CVE Program / CVE List V5
Vulnerability Description
kin-openapi is a Go project for handling OpenAPI files. Prior to 0.144.0, ValidationHandler.Load() in openapi3filter/validation_handler.go silently replaces a nil AuthenticationFunc with NoopAuthenticationFunc, which returns nil without checking credentials. This substitution causes every OpenAPI security requirement to be satisfied for unauthenticated requests when an application relies on ValidationHandler as its enforcement middleware. The no-op callback prevents the fail-closed ErrAuthenticationServiceMissing path from being reached and forwards the request to protected handlers that may require an API key, OAuth token, or another security scheme. This issue is fixed in version 0.144.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
getkin kin-openapi 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
getkin kin-openapi是getkin组织开源的一个 Go 的 OpenAPI 3.0 实现。 getkin kin-openapi 0.144.0之前版本存在授权问题漏洞，该漏洞源于ValidationHandler.Load()将nil AuthenticationFunc静默替换为NoopAuthenticationFunc，导致未认证请求满足所有OpenAPI安全要求，可能绕过身份验证并访问受保护资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkin kin-openapi < 0.144.0 -

II. Public POCs for CVE-2026-73501

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8384 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-73501

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Patches & Fixes for CVE-2026-73501 (1)

Vendor Advisories for CVE-2026-73501 (1)

Vendor Pages for CVE-2026-73501 (1)

IV. Related Vulnerabilities

Same product: kin-openapi
Same vendor: getkin
Same weakness: CWE-287

V. Comments for CVE-2026-73501

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