Vulnerability details

CVE-2026-46689

kanidm kanidm

Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion

CVSS 4.0

8.7High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
kanidm	kanidm	< 1.9.3	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/kanidm/kanidm/releases/tag/v1.9.3 x_refsource_MISC
https://github.com/kanidm/kanidm/security/advisories/GHSA-r5fr-9gmv-jggh x_refsource_CONFIRM

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Details

Published: 2026-06-10
Last updated: 2026-06-11
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.31%

Probability of exploitation in 30 days

24.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-248
Uncaught Exception
CWE-400
Uncontrolled Resource Consumption
CWE-674
Uncontrolled Recursion