What’s Vulnerable › Vulnerabilities

CVE-2026-100348: kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointer DoS)

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-15
• Weakness: CWE-476

Description

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3.Loader can dereference a nil SchemaRef.Value while resolving a self-referential additionalProperties JSON Reference such as a schema that points to its own additionalProperties member. Loading an attacker-controlled OpenAPI document through LoadFromData, LoadFromFile, or LoadFromURI reaches resolveComponent before document validation and can panic the loading process. Resolved additionalProperties schemas and ordinary recursive schemas do not take the vulnerable nil-value path. This issue is fixed in version 0.145.0.

Affected products

• getkin kin-openapi: before 0.145.0

References

• https://github.com/getkin/kin-openapi/commit/88aa64c7cbd03ecadbb419c473bdcaa8b0124c6b
• https://github.com/getkin/kin-openapi/releases/tag/v0.145.0
• https://github.com/getkin/kin-openapi/security/advisories/GHSA-mh7x-f8wq-4jhx

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