opencv-python versions before v4.8.1.78 bundled libwebp binaries in wheels that are vulnerable to CVE-2023-4863. opencv-python v4.8.1.78 upgrades the bundled libwebp binary to v1.3.2.
"https://github.com/pypa/advisory-database/blob/main/vulns/opencv-python/PYSEC-2023-183.yaml"