---
id: CVE-2018-5269
aliases:
  - GHSA-89rj-5ggj-3p9p
  - PYSEC-2026-2812
  - PYSEC-2026-703
title: Reachable Assertion in OpenCV.
summary: Reachable Assertion in OpenCV.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
vendor: opencv-python
product: opencv-python
ecosystem: pip
affected:
  - opencv-python < 3.4.1.15
  - opencv-contrib-python < 3.4.1.15
patched:
  - opencv-python 3.4.1.15
  - opencv-contrib-python 3.4.1.15
published: '2021-10-12'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:09.100947457Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-89rj-5ggj-3p9p'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2018-5269'
  - url: 'https://github.com/opencv/opencv/issues/10540'
  - url: 'https://github.com/opencv/opencv/pull/10563'
  - url: 'https://github.com/opencv/opencv-python'
  - url: 'https://lists.debian.org/debian-lts-announce/2018/04/msg00019.html'
  - url: 'https://lists.debian.org/debian-lts-announce/2018/07/msg00030.html'
  - url: 'https://lists.debian.org/debian-lts-announce/2021/10/msg00028.html'
  - url: 'http://www.securityfocus.com/bid/106945'
tags:
  - osv
  - pip
epss: 0.01384
epssPercentile: 0.70566
ingestedAt: '2026-07-08T18:25:47.340Z'
---

## Overview

In OpenCV 3.3.1 (corresponds with OpenCV-Python 3.3.1.11), an assertion failure happens in cv::RBaseStream::setPos in modules/imgcodecs/src/bitstrm.cpp because of an incorrect integer cast.

## Affected packages

- `opencv-python < 3.4.1.15`
- `opencv-contrib-python < 3.4.1.15`

## Remediation

Upgrade to a patched release:

- `opencv-python 3.4.1.15`
- `opencv-contrib-python 3.4.1.15`