CVE-2026-46689

HIGH

Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion

Title source: cna
STIX 2.1

Description

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/kanidm/kanidm/releases/tag/v1.9.3

Scores

CVSS v4 8.7
EPSS 0.0032
EPSS Percentile 23.1%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-248 CWE-400 CWE-674
Status published
Products (1)
kanidm/kanidm < 1.9.3
Published Jun 10, 2026
Tracked Since Jun 11, 2026