CVE-2026-100347 Details
Description
kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3filter.ValidationHandler uses the routers/legacy router, which passes an unsupported or non-canonical HTTP method for an existing static path to openapi3.PathItem.GetOperation. The default branch of GetOperation panics before authentication runs, so an unauthenticated remote client can repeatedly send methods such as PROPFIND or lowercase get to abort connections and generate stack-trace log growth. The specific panic requires an exact static path; a concrete path matched only by a templated route does not reach the same sink. This issue is fixed in version 0.145.0.
A denial-of-service vulnerability has been identified in Kin-OpenAPI versions prior to 0.145.0. The issue arises in the OpenAPI3 filter validation handler, which uses a legacy router that does not support non-canonical HTTP methods. When an unsupported method, such as PROPFIND or lowercase 'get', is sent to a static path, the router fails to match the route, leading to a panic in the GetOperation function. This panic occurs before authentication is processed, allowing an unauthenticated remote client to disrupt connections and cause log growth. The vulnerability requires an exact static path, as templated routes do not trigger the same issue.
Users can upgrade to Kin-OpenAPI version 0.145.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 15, 2026CISA-ADP
Assessed Oct 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/getkin/kin-openapi/commit/f1a5b523b82868d2d9be2e116b4e942892be72c3 | [email protected] | Source CodeVendor |
| https://github.com/getkin/kin-openapi/releases/tag/v0.145.0 | [email protected] | Release NotesVendor |
| https://github.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
| CWE-248 | Uncaught Exception | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| kin-openapi | <= 0.144.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | CVE Modified | CISA-ADP |
| Oct 15, 2026 | New CVE Received | [email protected] |