CVE-2026-100349: Null Dereference

Description

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.146.0, openapi3filter.ValidateResponse passes a nil response header schema to decodeValue when an OpenAPI document declares the header with content instead of schema. The document passes validation, but every response validation for the affected operation dereferences the nil schema and panics even when the response does not contain the declared header. Applications that ingest an untrusted specification can expose this as remote availability impact, while applications using only trusted local specifications still crash when the affected operation is exercised. This issue is fixed in version 0.146.0.

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Weakness Type (CWE)

CWE-476 CWE-476

References

Other References

https://github.com/getkin/kin-openapi/commit/f5441d67f855ed34d975b3b85665764644ab1459 https://github.com/getkin/kin-openapi/releases/tag/v0.146.0 https://github.com/getkin/kin-openapi/security/advisories/GHSA-74vm-87hj-r66f

Frequently Asked Questions

What is CVE-2026-100349? +

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.146.0, openapi3filter.ValidateResponse passes a nil response header schema to decodeValue when an OpenAPI document declares the header with content instead of schema. The document passes validation, but every response validation for the affected operation dereferences the nil schema and panics even when the response does not contain the declared header. Applications that ingest an untrusted specification can expose this as remote availability impact, while applications using only trusted local specifications still crash when the affected operation is exercised. This issue is fixed in version 0.146.0.

How do I check if I'm vulnerable to CVE-2026-100349? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-100349