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fkie_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 panics before authentication runs, so an unauthenticated remote client can repeatedly send methods such as PROPFIND or lowercase get to abort connections and generate stack-trace log growth. The specific panic requires an exact static path; a concrete path matched only by a templated route does not reach the same sink. This issue is fixed in version 0.145.0.

GHSA-fh4f-47mf-f2gj — kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a…

Affected: Go: github.com/getkin/kin-openapi

## 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 method token that is not one of the 9 standard methods — a legitimate-but-unsupported token such as `PROPFIND`, or a non-canonical case variant such as lowercase `get` — misses the trie, leaves `route == nil`, and for an existing **static** path falls through to `PathItem.GetOperation(method)`, whose `default:` case calls `panic(...)`. The panic fires inside route resolution, **before any authentication** runs. This is an unauthenticated, remotely triggerable denial of service (recovered per-connection panic + unbounded error-log growth).

## Root Cause - `openapi3filter/validation_handler.go:39` — `ValidationHandler.Load()` always constructs `legacyrouter.NewRouter(doc)`; there is no alternative router option on this path. - `routers/legacy/router.go:109` — the request method is used verbatim (`method, url := req.Method, ...`); there is no canonicalization or rejection of unknown method tokens. - `routers/legacy/router.go:69-70` — the trie is populated with `strings.ToUpper(method)` keys taken from `pathItem.Operations()` (canonical `http.Method*` constants only). - `routers/legacy/router.go:141` — `root.Match(method + " " + remainingPath)` misses for a non-canonical/unsu…

RHSA-2026:76677 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

google.golang.org/protobuf: golang-protobuf: Denial of Service via infinite loop when unmarshaling invalid JSON github.com/moby/sys/user: moby/sys/user: Denial of Service via crafted user or group database files grafana: grafana: Denial of Service via oversized Git Sync responses github.com/getkin/kin-openapi: kin-openapi: Denial of Service via nil-pointer dereference in openapi3filter github.com/getkin/kin-openapi: kin-openapi: Denial of Service via unsupported HTTP methods on static paths github.com/getkin/kin-openapi: kin-openapi: Denial of Service via nil pointer dereference in response validation github.com/getkin/kin-openapi: kin-openapi: Denial of Service via redundant regular expression compilation in query parameter decoding github.com/getkin/kin-openapi: kin-openapi: Authentication bypass via URL path decoding discrepancy axios: Axios: Information disclosure via improper CIDR proxy bypass handling undici: undici: Denial of Service via failed HTTP/2 WebSocket handshake