CVE-2026-46689

Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion

Published Jun 10, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-r5fr-9gmv-jggh scim_proto and kanidm_proto have an authenticated process abort via SCIM filter stack exhaustion
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 11, 2026, 12:55 PM
Reserved
May 15, 2026, 9:46 PM
Status
Deferred
Published
Jun 10, 2026, 10:17 PM
Modified
Jul 23, 2026, 9:10 AM