---
id: CVE-2019-19624
aliases:
  - GHSA-jggw-2q6g-c3m6
  - PYSEC-2026-2800
  - PYSEC-2026-2824
  - PYSEC-2026-2839
  - PYSEC-2026-723
title: Out-of-bounds Read in OpenCV
summary: Out-of-bounds Read in OpenCV
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
vendor: opencv-python
product: opencv-python
ecosystem: pip
affected:
  - opencv-python < 4.1.0.25
  - opencv-python-headless < 4.1.0.25
  - opencv-contrib-python < 4.1.0.25
  - opencv-contrib-python-headless < 4.1.0.25
patched:
  - opencv-python 4.1.0.25
  - opencv-python-headless 4.1.0.25
  - opencv-contrib-python 4.1.0.25
  - opencv-contrib-python-headless 4.1.0.25
published: '2021-10-12'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:09.240143626Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-jggw-2q6g-c3m6'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2019-19624'
  - url: 'https://github.com/opencv/opencv/issues/14554'
  - url: >-
      https://github.com/opencv/opencv/commit/d1615ba11a93062b1429fce9f0f638d1572d3418
  - url: 'https://access.redhat.com/security/cve/cve-2019-19624'
  - url: 'https://github.com/opencv/opencv-python'
  - url: 'https://github.com/opencv/opencv-python/releases/tag/25'
tags:
  - osv
  - pip
epss: 0.01756
epssPercentile: 0.76953
ingestedAt: '2026-07-08T18:25:50.778Z'
---

## Overview

An out-of-bounds read was discovered in OpenCV before 4.1.1 (OpenCV-Python before 4.1.0.25). Specifically, variable coarsest_scale is assumed to be greater than or equal to finest_scale within the calc()/ocl_calc() functions in dis_flow.cpp. However, this is not true when dealing with small images, leading to an out-of-bounds read of the heap-allocated arrays Ux and Uy.

## Affected packages

- `opencv-python < 4.1.0.25`
- `opencv-python-headless < 4.1.0.25`
- `opencv-contrib-python < 4.1.0.25`
- `opencv-contrib-python-headless < 4.1.0.25`

## Remediation

Upgrade to a patched release:

- `opencv-python 4.1.0.25`
- `opencv-python-headless 4.1.0.25`
- `opencv-contrib-python 4.1.0.25`
- `opencv-contrib-python-headless 4.1.0.25`