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MEDIUM severity

CVE-2019-16249 — opencv-python

MEDIUMFix: opencv/opencv#15531

CVE-2019-16249 is a medium-severity (CVSS 5.3) Out-of-bounds Read vulnerability in opencv-python. A fix is available for opencv-python — see the affected versions and patch details below.

Out-of-bounds Read in OpenCV

Also known asGHSA-x3rm-644h-67m8PYSEC-2026-2803PYSEC-2026-2833PYSEC-2026-2842PYSEC-2026-726
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs76th percentile — riskier than 76% of all scored CVEsHighest risk
0.00%0.73%1.45%2.18%0.2%1.7%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2019-16249 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

4 pkgs affected
🐍opencv-python🐍opencv-python-headless🐍opencv-contrib-python🐍opencv-contrib-python-headless

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

OpenCV 4.1.1 has an out-of-bounds read in hal_baseline::v_load in core/hal/intrin_sse.hpp when called from computeSSDMeanNorm in modules/video/src/dis_flow.cpp.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIopencv-pythonall versions4.1.2.30pip install --upgrade 'opencv-python==4.1.2.30'
🐍PyPIopencv-python-headlessall versions4.1.2.30pip install --upgrade 'opencv-python-headless==4.1.2.30'
🐍PyPIopencv-contrib-pythonall versions4.1.2.30pip install --upgrade 'opencv-contrib-python==4.1.2.30'
🐍PyPIopencv-contrib-python-headlessall versions4.1.2.30pip install --upgrade 'opencv-contrib-python-headless==4.1.2.30'

Affected Products

1 product · 1 configurations
Application
opencvopencv
1 version
4.1.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for opencv-python, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update opencv-python to 4.1.2.30 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-16249 is resolved across your whole dependency graph.

  3. Workarounds

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Frequently Asked Questions

OpenCV 4.1.1 has an out-of-bounds read in hal_baseline::v_load in core/hal/intrin_sse.hpp when called from computeSSDMeanNorm in modules/video/src/dis_flow.cpp.
O3 Security · Impact-Aware SCA

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CVE-2019-16249: opencv-python — Fixed in 4.1.2.30