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TI-2026-34320 Aliases CVE-2026-46689GHSA-r5fr-9gmv-jggh

Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion

Priority HIGH 77CWE-248Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-248.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00317 24th percentileScored 2026-11-07
Fix Fixed kanidm (kanidm): 1.9.3scim_proto (crates.io): 1.9.3+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
kanidmkanidmbefore 1.9.31.9.3Patch availableCNA
—scim_proto (crates.io)before 1.9.31.9.3Patch availableGHSA-r5fr-9gmv-jggh
—kanidm_proto (crates.io)before 1.9.31.9.3Patch availableGHSA-r5fr-9gmv-jggh
  • kanidm Vendorkanidm Affected before 1.9.3 Fixed in 1.9.3 Patch available CNA
  • scim_proto (crates.io) Vendor— Affected before 1.9.3 Fixed in 1.9.3 Patch available GHSA-r5fr-9gmv-jggh
  • kanidm_proto (crates.io) Vendor— Affected before 1.9.3 Fixed in 1.9.3 Patch available GHSA-r5fr-9gmv-jggh

Remediation

  • Fix · CNA kanidm (kanidm) Fixed in 1.9.3
  • Fix · GHSA-r5fr-9gmv-jggh scim_proto (crates.io) Fixed in 1.9.3 Advisory →
  • Fix · GHSA-r5fr-9gmv-jggh kanidm_proto (crates.io) Fixed in 1.9.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46689
  2. 2026-10-03 Alias added: GHSA-r5fr-9gmv-jggh

References

Advisory 1

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences