{"items":[{"id":"NVI-00015083","kind":"vulnerability","title":"kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-r277-6w6q-xmqw"],"plain_summary":"GitHub lists this reviewed advisory for github.com/getkin/kin-openapi. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-1ccfa48870c4f25bc11d99f4d44fd523"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-08-14T04:21:32.000Z","value":"9.1 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1ccfa48870c4f25bc11d99f4d44fd523"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-1ccfa48870c4f25bc11d99f4d44fd523","url":"https://github.com/advisories/GHSA-r277-6w6q-xmqw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r277-6w6q-xmqw","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T20:16:47.162Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1ccfa48870c4f25bc11d99f4d44fd523"],"technology":"github.com/getkin/kin-openapi","known_exclusions":[],"conditions_summary":"### Summary\n`ValidationHandler.Load()` in `getkin/kin-openapi` silently replaces a nil `AuthenticationFunc` with `NoopAuthenticationFunc`, which always returns `nil` without performing any credential check. Because this substitution happens unconditionally when the caller omits the field, every OpenAPI `security` requirement declared in the spec is silently satisfied for unauthenticated requests. An unauthenticated remote attacker can reach handlers for routes whose OpenAPI operation requires an API key, OAuth token, or any other security scheme if the application relies on `ValidationHandler` as its enforcement middleware. \n\n### Details\n`ValidationHandler` is an HTTP middleware exported by `openapi3filter` that validates incoming requests and responses against a loaded OpenAPI specification. Its `Load()` method initialises default fields before the handler begins serving:\n\n```go\n// openapi3filter/validation_handler.go:47-49\nif h.AuthenticationFunc == nil {\n    h.AuthenticationFunc = NoopAuthenticationFunc\n}\n```\n\n`NoopAuthenticationFunc` is defined as:\n\n```go\n// openapi3filter/validation_handler.go:17-18\nfunc NoopAuthenticationFunc(context.Context, *AuthenticationInput) error { ret","public_affected_ranges":["<= 0.143.0"]}],"null_published_at":"2026-11-03T10:03:26.545Z","source_updated_at":"2026-08-14T04:21:32.000Z","source_disclosed_at":"2026-07-24T16:52:05.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T20:16:47.162Z"}],"next_cursor":null,"snapshot_revision":"42594"}