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CVE-2026-73502— kin-openapi openapi3filter: unauthenticated nil-pointer panic when validating a request against a `content` parameter whose media type has no schema

Quick assessment

Affected
getkin kin-openapi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

kin-openapi 是一个用于处理 OpenAPI 文件的 Go 语言项目。从版本 0.2.0 到 0.144.0，当某个操作声明的 媒体类型内容参数缺少 schema（模式定义）时， 函数可能引发空指针解引用，从而导致拒绝服务（DoS）。 在文件 中，默认的 函数在解引用 之前，未检查 是否为 。然而， 函数在 OpenAPI 3.0.x 和 3.1.x 规范下却会接受此类文档。 因此，攻击者只需发送一个未经认证的请求并提供该参数的值，即可导致请求验证过程发生 panic，引发请求中断。在常见的同步 路径中，

CVSS 5.3 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
getkin kin-openapi >= 0.2.0, < 0.144.0 affected
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I. Basic Information for CVE-2026-73502

Vulnerability Information
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Vulnerability Title
kin-openapi openapi3filter: unauthenticated nil-pointer panic when validating a request against a `content` parameter whose media type has no schema
Source: CVE Program / CVE List V5
Vulnerability Description
kin-openapi is a Go project for handling OpenAPI files. From 0.2.0 until 0.144.0, openapi3filter.ValidateRequest can encounter a NULL-pointer-dereference denial of service when an operation declares a content parameter whose application/json media type has no schema. In openapi3filter/req_resp_decoder.go, the default defaultContentParameterDecoder dereferences mt.Schema.Value without checking whether mt.Schema is nil, even though doc.Validate() accepts the document under OpenAPI 3.0.x and 3.1.x. A single unauthenticated request supplying the parameter value can panic request validation, causing an aborted request with log growth in the common synchronous net/http path or a full process crash in integrations without recovery. This issue is fixed in version 0.144.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkin kin-openapi >= 0.2.0, < 0.144.0 -

II. Public POCs for CVE-2026-73502

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III. Intelligence Information for CVE-2026-73502

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Patches & Fixes for CVE-2026-73502 (1)

Vendor Advisories for CVE-2026-73502 (1)

Vendor Pages for CVE-2026-73502 (1)

IV. Related Vulnerabilities

Same product: kin-openapi
Same vendor: getkin
Same weakness: CWE-476

V. Comments for CVE-2026-73502

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