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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-r5fr-9gmv-jggh scim_proton and kanidm_proto have an authenticated process abort via SCIM filter stack exhaustion
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 11 Jun 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Kanidm
Kanidm kanidm
Vendors & Products Kanidm
Kanidm kanidm

Wed, 10 Jun 2026 21:00:00 +0000

Type Values Removed Values Added
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.
Title Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion
Weaknesses CWE-248
CWE-400
CWE-674
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-10T20:28:44.009Z

Reserved: 2026-05-15T21:46:51.548Z

Link: CVE-2026-46689

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-10T22:17:00.443

Modified: 2026-06-10T22:17:00.443

Link: CVE-2026-46689

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-11T10:40:51Z

Weaknesses