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

8.7HIGH

Key Information:

Vendor

Kanidm

Status
Kanidm
Vendor
CVE Published:
10 June 2026

What is CVE-2026-46689?

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 extractor, before any handler body and therefore before any ACL check. This issue has been patched in version 1.9.3.

Affected Version(s)

kanidm < 1.9.3

References

https://github.com/kanidm/kanidm/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/kanidm/kanidm/releases/tag/v1.9.3
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.