CVE-2026-46689 Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion

Kanidm is an identity management platform. Prior to version 1.9.3, a single unauthenticated GET to any /scim/v1/... endpoint with a ?filter= query string of a few thousand nested parentheses ≈ 4–12 KB drives the recursive-descent PEG parser past the worker thread's stack guard page. Rust responds...