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

Quick assessment

Affected

kanidm kanidm

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kanidm是Kanidm开源的一款简单安全的身份管理平台。 Kanidm 1.9.3之前版本存在安全漏洞，该漏洞源于SCIM端点中递归下降PEG解析器处理嵌套括号时导致栈溢出，可能造成进程退出。

AI Predicted 7.5 Difficulty: Trivial EPSS 0.32% · P25 Updated Jun 13, 2026

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

Vendor	Product	Version Range	Status
kanidm	kanidm	`< 1.9.3`	affected

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I. Basic Information for CVE-2026-46689

Vulnerability Information

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

Kanidm: Unauthenticated process abort via SCIM filter stack exhaustion

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

未捕获的异常

Source: CVE Program / CVE List V5

Vulnerability Title

Kanidm 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
kanidm	kanidm	< 1.9.3	-

II. Public POCs for CVE-2026-46689

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-46689

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Vendor Advisories for CVE-2026-46689 (1)

🔗 Unauthenticated process abort via SCIM filter stack exhaustion · Advisory · kanidm/kanidm · GitHub Read full article x_refsource_CONFIRM

Vendor Pages for CVE-2026-46689 (1)

🔗 Release v1.9.3 · kanidm/kanidm · GitHub x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-46689

IV. Related Vulnerabilities

Same weakness: CWE-248