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CVE-2026-76905— kin-openapi openai3filter: nil-pointer panic in ConvertErrors on malformed multipart/form-data body enables unauthenticated DoS

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 项目。在版本 0.10.0 至 0.141.0 期间， 中的 函数在解引用 之前，未检查 是否为 nil。当 multipart/form-data 请求体的非字符串标量字段格式错误时，会生成一个嵌套的 ParseError，其 为 nil；若应用程序通过 或 渲染该验证错误，则会导致 panic。如果应用缺乏恢复机制（recovery boundary），未经身份验证的客户端可反复发送此类请求，从而导致服务拒绝。JSON 请求体以及未使用这些错

CVSS 7.5 · High EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
getkin kin-openapi >= 0.10.0, < 0.141.0 affected
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I. Basic Information for CVE-2026-76905

Vulnerability Information
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Vulnerability Title
kin-openapi openai3filter: nil-pointer panic in ConvertErrors on malformed multipart/form-data body enables unauthenticated DoS
Source: CVE Program / CVE List V5
Vulnerability Description
kin-openapi is a Go project for handling OpenAPI files. From 0.10.0 until 0.141.0, openapi3filter.convertParseError in openapi3filter/validation_error_encoder.go dereferences e.Parameter.In without checking whether e.Parameter is nil. A malformed non-string scalar field in a multipart/form-data request body produces a nested ParseError with a nil RequestError.Parameter, and applications that render the validation error through openapi3filter.ConvertErrors or ValidationErrorEncoder panic. An unauthenticated client can repeatedly send such requests to deny service when the application lacks a recovery boundary. JSON request bodies and applications that do not use these error-rendering helpers are not affected. This issue is fixed in version 0.141.0.
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:H
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 >= 0.10.0, < 0.141.0 -

II. Public POCs for CVE-2026-76905

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III. Intelligence Information for CVE-2026-76905

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Patches & Fixes for CVE-2026-76905 (1)

Vendor Advisories for CVE-2026-76905 (1)

Other References for CVE-2026-76905 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-76905

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