CVE-2026-100354

A flaw was found in kin-openapi. The runtime schema validation lacks cycle detection when processing circular schema references. A remote attacker can exploit this vulnerability by submitting a request or response that triggers recursive validation, leading to unbounded recursion and stack...

CVE-2026-100353

A flaw was found in kin-openapi. An unauthenticated remote attacker can cause a Denial of Service DoS by sending specially crafted HTTP requests containing specific array query parameters or form-encoded data. Because the request decoder fails to properly validate certain array schemas before...

CVE-2026-97394

A flaw was found in kin-openapi's openapi3filter module. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service DoS by crashing the application. The issue occurs when processing OpenAPI 3.1 array schemas that lack an items definition, causing the parser to...

EUVD-2026-102159

kin-openapi openapi3filter: nil-pointer panic in ValidateResponse on a response header declared with content...

kin-openapi openapi3filter: nil-pointer panic in ValidateResponse on a response header declared with content

Summary ValidateResponse panics on a nil pointer when a spec declares a response header with content instead of schema. doc.Validate accepts that document, so the crash comes from a spec the library just called valid. Same class as GHSA-jpcw-4wr7-c3vq, which covered the request-parameter case in...

CVE-2026-100347

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3filter.ValidationHandler uses the routers/legacy router, which passes an unsupported or non-canonical HTTP method for an existing static path to openapi3.PathItem.GetOperation. The default branch of GetOperation...

CVE-2026-100348

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3.Loader can dereference a nil SchemaRef.Value while resolving a self-referential additionalProperties JSON Reference such as a schema that points to its own additionalProperties member. Loading an attacker-controlle...

CVE-2026-100353

kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.149.0, three openapi3filter decoder paths that were missed by the fix for GHSA-p6wj-qrr4-pgh5 lack a nil-items guard for legal OpenAPI 3.1 array schemas. An unauthenticated remote client can trigger a deterministic...

GHSA-VRCC-3CH7-HPPW kin-openapi: Incomplete Fix for GHSA-p6wj-qrr4-pgh5: Three Unpatched nil-Items Panic Paths in openapi3filter

Summary The fix for GHSA-p6wj-qrr4-pgh5 addressed a nil-pointer dereference that occurs when an OpenAPI 3.1 array schema omits the items keyword which is legal under JSON Schema 2020-12. That fix patched three decoder paths: the standalone parseArray function, the top-level array check in...

kin-openapi: Incomplete Fix for GHSA-p6wj-qrr4-pgh5: Three Unpatched nil-Items Panic Paths in openapi3filter

Summary The fix for GHSA-p6wj-qrr4-pgh5 addressed a nil-pointer dereference that occurs when an OpenAPI 3.1 array schema omits the items keyword which is legal under JSON Schema 2020-12. That fix patched three decoder paths: the standalone parseArray function, the top-level array check in...

GHSA-G8CF-RCJF-C8CF kin-openapi: Uncontrolled Recursion on Circular allOf/anyOf/oneOf Schemas Causes Fatal Process Crash

Summary kin-openapi's spec loader and spec-time validator both handle circular schema references safely: the loader resolves circular $refs on purpose to support recursive data structures, and Schema.validate uses stack-based cycle detection. Validate therefore accepts a schema whose allOf / anyO...

kin-openapi: Uncontrolled Recursion on Circular allOf/anyOf/oneOf Schemas Causes Fatal Process Crash

Summary kin-openapi's spec loader and spec-time validator both handle circular schema references safely: the loader resolves circular $refs on purpose to support recursive data structures, and Schema.validate uses stack-based cycle detection. Validate therefore accepts a schema whose allOf / anyO...

GHSA-RJ39-CV6W-8WV7 kin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation Path

Summary kin-openapi guards against NaN and Inf values in its built-in schema visitor visitJSON by returning ErrSchemaInputNaN / ErrSchemaInputInf when a float64 input violates those constraints. For OAS 3.1 specs, however, Schema.VisitJSON routes through useJSONSchema2020, which hands the value...

kin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation Path

Summary kin-openapi guards against NaN and Inf values in its built-in schema visitor visitJSON by returning ErrSchemaInputNaN / ErrSchemaInputInf when a float64 input violates those constraints. For OAS 3.1 specs, however, Schema.VisitJSON routes through useJSONSchema2020, which hands the value...

GHSA-23VG-4CJM-66Q5 kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion

Summary openapi3filter.ValidationHandler.Middleware validates requests with kin-openapi's legacy router, which selects an OpenAPI operation from the decoded URL.Path. The method is documented as implementing gorilla/mux.MiddlewareFunc, but a downstream gorilla/mux router configured with...

kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion

Summary openapi3filter.ValidationHandler.Middleware validates requests with kin-openapi's legacy router, which selects an OpenAPI operation from the decoded URL.Path. The method is documented as implementing gorilla/mux.MiddlewareFunc, but a downstream gorilla/mux router configured with...

GHSA-H4R5-MXV5-8MJC kin-openapi deepObject query decoding repeatedly compiles an invariant regular expression

Summary openapi3filter decodes deepObject-style query parameters by looping over every key in the request's query string. Inside that loop it recompiles a loop-invariant regular expression on every iteration. The pattern depends only on the spec-defined parameter name, not on the loop variable, s...

GHSA-MH7X-F8WQ-4JHX kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointer DoS)

The defect ---------- Confirmed at HEAD f0407d5, v0.144.0. openapi3/loader.go, inside resolveComponent's drill closure around line 455, the case SchemaRef branch for pathPart == "additionalProperties" dereferences c.Value.AdditionalProperties with no nil-check on c.Value: case SchemaRef: if...

kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointer DoS)

The defect ---------- Confirmed at HEAD f0407d5, v0.144.0. openapi3/loader.go, inside resolveComponent's drill closure around line 455, the case SchemaRef branch for pathPart == "additionalProperties" dereferences c.Value.AdditionalProperties with no nil-check on c.Value: case SchemaRef: if...

GHSA-FH4F-47MF-F2GJ kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path

Summary The openapi3filter.ValidationHandler the exported, documented request-validation middleware hard-wires the legacy router routers/legacy. That router matches the incoming request method verbatim against a trie built exclusively from upper-cased canonical HTTP methods. A request carrying a...