Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M

CVE-2026-46689Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion

High 8.7

In plain English

A high-severity uncontrolled resource consumption in kanidm from kanidm. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.3%top 75.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
kanidm	kanidm	< 1.9.3

Weakness: CWE-248, CWE-400, CWE-674 · 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

References

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