CVE-2026-100351: high-severity vulnerability in getkin kin-openapi
kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 0.5%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
getkin · kin-openapiRelated CVEs — getkin kin-openapi
In the same product, most dangerous first.
CVE-2025-30153HIGHImproper Handling of Highly Compressed Data (Data Amplification) in github.com/getkin/kin-openapi/openapi3filterEPSS 0.6%CVE-2026-97394HIGHkin-openapi: Nil-pointer dereference panic in openapi3filter for OpenAPI 3.1 array schemas missing itemsEPSS 0.6%CVE-2026-76905HIGHkin-openapi openai3filter: nil-pointer panic in ConvertErrors on malformed multipart/form-data body enables unauthenticated DoSEPSS 0.6%CVE-2026-100352HIGHkin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation PathEPSS 0.6%CVE-2026-77354HIGHkin-openapi: Uncontrolled resource consumption in openapi3filter deepObject query parameter decodingEPSS 0.5%CVE-2026-100347MEDIUMkin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static pathEPSS 0.5%