high8.7
CVE-2026-46689
scim_proto and kanidm_proto have an authenticated process abort via SCIM filter stack exhaustion
Impact
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 to stack overflow with std::process::abort() — the entire kanidmd process exits. The parse runs inside axum's Query<ScimEntryGetQuery> extractor, before any handler body and therefore before any ACL check. This issue has been patched in version 1.9.3.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | scim_proto | <= 1.9.2 | 1.9.3 |
| rust | kanidm_proto | <= 1.9.2 | 1.9.3 |