---
id: CVE-2022-31605
aliases:
  - GHSA-hrf3-622q-8366
  - PYSEC-2022-232
title: Unsafe yaml deserialization in NVFlare
summary: Unsafe yaml deserialization in NVFlare
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: nvflare
product: nvflare
ecosystem: pip
affected:
  - nvflare < 2.1.2
patched:
  - nvflare 2.1.2
published: '2022-06-22'
updated: '2026-07-08'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-hrf3-622q-8366'
references:
  - url: 'https://github.com/NVIDIA/NVFlare/security/advisories/GHSA-hrf3-622q-8366'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2022-31605'
  - url: >-
      https://github.com/NVIDIA/NVFlare/commit/4de9782697ecb12f39bcae83221bd8d3498959be
  - url: 'https://github.com/NVIDIA/NVFlare'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/nvflare/PYSEC-2022-232.yaml
tags:
  - osv
  - pip
epss: 0.02079
epssPercentile: 0.80728
ingestedAt: '2026-07-08T18:25:50.311Z'
---

## Overview

### Impact
NVFLARE contains a vulnerability in its utils module, where YAML files are loaded via yaml.load() instead of yaml.safe_load(). The deserialization of Untrusted Data, may allow an unprivileged network attacker to cause Remote Code Execution, Denial Of Service, and Impact to both Confidentiality and Integrity.

All versions before 2.1.2 are affected.
CVSS Score = 9.8
[AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fnvd.nist.gov%2Fvuln-metrics%2Fcvss%2Fv3-calculator%3Fvector%3DAV%3AN%2FAC%3AL%2FPR%3AN%2FUI%3AN%2FS%3AU%2FC%3AH%2FI%3AH%2FA%3AH&data=05%7C01%7Cchesterc%40nvidia.com%7Ce9600bde16854b0b380008da4fc544f7%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C637910005925574215%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=5kBrXEmAbqp8R31JCH%2FG95MUly72UPVihnBwiRFmvBY%3D&reserved=0)


### Patches

The patch will be included in nvflare==2.1.2


### Workarounds
Change yaml.load() to yaml.safe_load()

### Additional information
Issue Found by: Oliver Sellwood (@Nintorac)



## Affected packages

- `nvflare < 2.1.2`

## Remediation

Upgrade to a patched release:

- `nvflare 2.1.2`