kin-openapi: Nil-pointer dereference panic in openapi3filter for OpenAPI 3.1 array schemas missing items

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97394
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 16:18:25 UTC
Updated2026-10-20 03:17:17 UTC
Descriptionkin-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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004410000 probability, percentile 0.369550000 (date 2026-10-20)

Problem Types: CWE-248 | CWE-476 | CWE-248 CWE-248: Uncaught Exception | CWE-476 CWE-476: NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Getkin Kin-openapi affected >= 0.136.0, < 0.143.0 Not specified

References

ReferenceSourceLinkTags
github.com/opnsense/core/security/advisories/GHSA-26cj-h9rj-g5pf 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/getkin/kin-openapi/security/advisories/GHSA-p6wj-qrr4-pgh5 [email protected] github.com
github.com/getkin/kin-openapi/releases/tag/v0.143.0 [email protected] github.com
github.com/getkin/kin-openapi/commit/30e292371a89ca6d1f91a9553e0aa518b49... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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