---
title: "CVE-2020-15366\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2020-15366?format=md
keywords: index, follow
---

# CVE-2020-15366

Publication date 15 July 2020

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.6 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2020-15366?format=md#impact-score)

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## 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.)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| node-ajv | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Needs evaluation |
| 19.10 eoan | Ignored end of life |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.6 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | Low |
  | Integrity impact | Low |
  | Availability impact | Low |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.6 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15366)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-15366)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-15366)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-15366)

### Other references

* <https://github.com/ajv-validator/ajv/releases/tag/v6.12.3>
* <https://github.com/ajv-validator/ajv/tags>
* <https://hackerone.com/bugs?subject=user&report_id=894259>
* <https://www.cve.org/CVERecord?id=CVE-2020-15366>