CVE-2026-100347

MEDIUM 5.3

kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-20 CWE-248
Vendor	getkin
Product	kin-openapi
Published	Oct 15, 2026
Last Updated	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:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

getkin / kin-openapi

< 0.145.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj github.com: https://github.com/getkin/kin-openapi/commit/f1a5b523b82868d2d9be2e116b4e942892be72c3 github.com: https://github.com/getkin/kin-openapi/releases/tag/v0.145.0