What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-10 · updated 2026-07-23
• Weakness: CWE-248

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

• kanidm: before 1.9.3

References

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

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