---
id: CVE-2026-116011
title: >-
  Crow before 1.3.4 Denial of Service via Deeply Nested JSON in
  crow::json::load()
summary: >-
  Crow before 1.3.4 contains an uncontrolled recursion vulnerability in
  crow::json::load() that allows remote unauthenticated attackers to crash the
  server by sending deeply nested JSON. Attackers can send a request body with
  thousands of …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-674
vendor: CrowCpp
product: Crow
affected:
  - Crow < 1.3.4
published: '2026-10-24'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T11:40:30.179Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116011'
references:
  - url: 'https://github.com/CrowCpp/Crow/security/advisories/GHSA-7x84-xhp8-6cqj'
    label: GitHub Security Advisory (GHSA-7x84-xhp8-6cqj)
  - url: >-
      https://github.com/CrowCpp/Crow/commit/6956b7ca93c5df22f5aaccd670e5aa000c0d882b
  - url: 'https://github.com/CrowCpp/Crow/releases/tag/v1.3.4'
    label: Crow v1.3.4 Release Notes
  - url: 'https://github.com/CrowCpp/Crow/blob/v1.3.3/include/crow/json.h#L878'
  - url: >-
      https://www.vulncheck.com/advisories/crow-before-1.3.4-denial-of-service-via-deeply-nested-json-in-crow-json-load
    label: >-
      VulnCheck Advisory: Crow before 1.3.4 Denial of Service via Deeply Nested
      JSON in crow::json::load()
tags:
  - cve.org
ingestedAt: '2026-10-24T11:57:47.030Z'
---

## Overview

Crow before 1.3.4 contains an uncontrolled recursion vulnerability in crow::json::load() that allows remote unauthenticated attackers to crash the server by sending deeply nested JSON. Attackers can send a request body with thousands of nested objects to exhaust the worker thread stack, terminating the process and dropping all connections.

## Affected

- `Crow < 1.3.4`

## Remediation

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