CVE-2026-100354

HIGH 7.5

kin-openapi: Uncontrolled Recursion on Circular allOf/anyOf/oneOf Schemas Causes Fatal Process Crash

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.149.0, runtime request, response, and direct schema validation lacks cycle detection when an allOf, anyOf, or oneOf chain refers back to an ancestor schema, even though loading and document validation accept the circular reference. A request or response that reaches the affected schema causes unbounded recursion in Schema.visitJSON or openapi3filter.decodeValue and exhausts the Go goroutine stack. The resulting fatal stack overflow cannot be caught with recover and terminates the entire process, including unrelated requests. This issue is fixed in version 0.149.0.

CWE	CWE-674
Vendor	getkin
Product	kin-openapi
Published	Oct 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

getkin / kin-openapi

< 0.149.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/getkin/kin-openapi/security/advisories/GHSA-g8cf-rcjf-c8cf github.com: https://github.com/getkin/kin-openapi/commit/9245cef66c840e27a08409a8a5cd0ee930c5bcff github.com: https://github.com/getkin/kin-openapi/releases/tag/v0.149.0