CVE-2026-97394
kin-openapi: Nil-pointer dereference panic in openapi3filter for OpenAPI 3.1 array schemas missing items
Impact
kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.143.0, openapi3filter accepts OpenAPI 3.1 array schemas without an items keyword and then dereferences the nil Schema.Items value while decoding application/x-www-form-urlencoded or multipart/form-data request bodies, response headers, and other array parameter surfaces. A remote unauthenticated client can reach an affected operation with a nonempty request or matching response and deterministically trigger a nil-pointer panic during ValidateRequest or ValidateResponse. OpenAPI 3.0 documents are not affected because document validation rejects arrays without items, and JSON request bodies use a different decoder path. This issue is fixed in version 0.143.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/getkin/kin-openapi | >= 0.136.0, < 0.143.0 | 0.143.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-p6wj-qrr4-pgh5
- https://github.com/getkin/kin-openapi/security/advisories/GHSA-p6wj-qrr4-pgh5
- https://nvd.nist.gov/vuln/detail/CVE-2026-97394
- https://github.com/getkin/kin-openapi/commit/30e292371a89ca6d1f91a9553e0aa518b49f838d
- https://github.com/getkin/kin-openapi/releases/tag/v0.143.0
- https://github.com/opnsense/core/security/advisories/GHSA-26cj-h9rj-g5pf