In PHP versions 7.3.x below 7.3.26, 7.4.x below 7.4.14 and 8.0.0, when validating URL with functions like filter_var($url, FILTER_VALIDATE_URL), PHP will accept an URL with invalid password as valid URL. This may lead to functions that rely on URL being valid to mis-parse the URL and produce wrong data as components of the URL.
https://www.tenable.com/security/tns-2021-14
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.debian.org/security/2021/dsa-4856
https://security.netapp.com/advisory/ntap-20210312-0005/
https://security.gentoo.org/glsa/202105-23
https://lists.debian.org/debian-lts-announce/2021/07/msg00008.html