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CVE-2026-100351— kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion

Quick assessment

Affected
getkin kin-openapi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

kin-openapi 是一个用于处理 OpenAPI 文件的 Go 语言项目。在版本 0.144.0 至 0.147.0 之间，openapi3filter.ValidationHandler 会从解码后的 URL.Path 中验证所选的操作（operation）；而下游的 gorilla/mux 路由器如果配置了 UseEncodedPath 选项，则可能从 URL.RawPath（原始未解码路径）中分发不同的操作。当某个公开的精确路由与一个受保护的参数化路由具有相同的方法（HTTP 方法），且在解码后路径重合

CVSS 7.4 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
getkin kin-openapi >= 0.144.0, < 0.147.0 affected
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I. Basic Information for CVE-2026-100351

Vulnerability Information
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Vulnerability Title
kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion
Source: CVE Program / CVE List V5
Vulnerability Description
kin-openapi is a Go project for handling OpenAPI files. From 0.144.0 until 0.147.0, openapi3filter.ValidationHandler validates an operation selected from decoded URL.Path while a downstream gorilla/mux router configured with UseEncodedPath can dispatch a different operation selected from URL.RawPath. When a public exact route and a protected parameterized route use the same method and overlap after decoding, an unauthenticated remote request containing an encoded path separator can be validated as public and then dispatched to the protected handler without invoking the configured AuthenticationFunc. The reachable path parameter is constrained to an encoded representation that decodes to the public literal route, and proxies that canonicalize the URI before forwarding prevent this specific mismatch. This issue is fixed in version 0.147.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选名称进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkin kin-openapi >= 0.144.0, < 0.147.0 -

II. Public POCs for CVE-2026-100351

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III. Intelligence Information for CVE-2026-100351

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Vendor Advisories for CVE-2026-100351 (1)

Vendor Pages for CVE-2026-100351 (1)

Same Patch Batch · getkin · 2026-10-15 · 9 CVEs total

CVE-2026-100349 8.2 HIGH kin-openapi openapi3filter: nil-pointer panic in ValidateResponse on a response header dec
CVE-2026-97394 7.5 HIGH kin-openapi: Nil-pointer dereference panic in openapi3filter for OpenAPI 3.1 array schemas
CVE-2026-100352 7.5 HIGH kin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation P
CVE-2026-100353 7.5 HIGH kin-openapi: Incomplete Fix for GHSA-p6wj-qrr4-pgh5: Three Unpatched nil-Items Panic Paths
CVE-2026-100354 7.5 HIGH kin-openapi: Uncontrolled Recursion on Circular allOf/anyOf/oneOf Schemas Causes Fatal Pro
CVE-2026-100348 5.3 MEDIUM kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointe
CVE-2026-100350 5.3 MEDIUM kin-openapi deepObject query decoding repeatedly compiles an invariant regular expression
CVE-2026-100347 5.3 MEDIUM kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical

IV. Related Vulnerabilities

Same product: kin-openapi
Same vendor: getkin
Same weakness: CWE-289

V. Comments for CVE-2026-100351

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