Vulnerability in Getkin Kin-Openapi
CVE-2026-100351
kin-openapi is a Go project for handling OpenAPI files. From 0.144.0 until 0.147.0, openapi3filter.ValidationHandler validates an operation selected from decoded URL.Path while a downstream gorilla/mux router configured with UseEncodedPath can dispatch a different operation selected from URL.RawPath. When a public exact route and a protected parameterized route use the same method and overlap after decoding, an unauthenticated remote request containing an encoded path separator can be validated as public and then dispatched to the protected handler without invoking the configured AuthenticationFunc. The reachable path parameter is constrained to an encoded representation that decodes to the public literal route, and proxies that canonicalize the URI before forwarding prevent this specific mismatch. This issue is fixed in version 0.147.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Getkin Kin-Openapi — versions >= 0.144.0, < 0.147.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-100351?
- CVE-2026-100351 is a high-severity vulnerability in Getkin Kin-Openapi, classified under CWE-289. CVSS score: 7.4/10. Published 2026-10-15.
- How severe is CVE-2026-100351?
- High severity. CVSS v3 base score is 7.4 out of 10.