CVE-2026-100347CWE-20CWE-248

CVE-2026-100347

Medium · published October 15, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
43.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00515 · 43.0th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-248 · Uncaught Exception
Published
2026-10-15T20:17Z
References (4)
https://github.com/getkin/kin-openapi/commit/f1a5b523b82868d2d9be2e116b4e942892be72c3 · [email protected]https://github.com/getkin/kin-openapi/releases/tag/v0.145.0 · [email protected]https://github.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj · [email protected]https://github.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 OCT 03:27Z
    EPSS moved — → 1%
    epss
  • 15 OCT 15:35Z
    kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path
    cvelistv5
  • 15 OCT 15:35Z
    kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path
    cvelistv5