---
id: CVE-2026-100350
title: kin-openapi is a Go project for handling OpenAPI files
summary: >-
  kin-openapi is a Go project for handling OpenAPI files. From 0.145.0 until
  0.146.0, openapi3filter repeatedly calls regexp.MustCompile for the same
  parameter-name regular expression inside the per-query-key loop in
  urlValuesDecoder.Decod…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-400
  - CWE-770
  - CWE-1050
vendor: getkin
product: kin-openapi
affected:
  - 'kin-openapi >= 0.145.0, < 0.146.0'
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T19:17:12.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100350'
references:
  - url: >-
      https://github.com/getkin/kin-openapi/commit/d090e36b2f1c42c898ba2a687a8f6e25f5ca727f
    label: security-advisories@github.com
  - url: 'https://github.com/getkin/kin-openapi/releases/tag/v0.146.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/getkin/kin-openapi/security/advisories/GHSA-h4r5-mxv5-8mjc
    label: security-advisories@github.com
  - url: >-
      https://github.com/getkin/kin-openapi/security/advisories/GHSA-h4r5-mxv5-8mjc
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-15T18:32:09.281614Z'
ingestedAt: '2026-10-15T16:13:11.072Z'
---

## Overview

kin-openapi is a Go project for handling OpenAPI files. From 0.145.0 until 0.146.0, openapi3filter repeatedly calls regexp.MustCompile for the same parameter-name regular expression inside the per-query-key loop in urlValuesDecoder.DecodeObject used to decode a deepObject query parameter. An unauthenticated remote client can send an affected endpoint a request containing many unrelated query keys, causing ValidateRequest to perform work and allocations proportional to the attacker-controlled key count for every deepObject parameter. The expression itself is fixed and this is not regular expression denial of service; the resource consumption comes from loop-invariant recompilation. This issue is fixed in version 0.146.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.