CVE-2021-36773

CVE-2021-36773 is a denial-of-service vulnerability affecting uBlock Origin before version 1.36.2 and uMatrix before version 4.4.9. Malicious websites can exploit an arbitrary depth of parameter nesting in strict blocking, leading to unbounded recursion, excessive memory consumption, and a complete loss of blocking functionality. Rated with a CVSS score of 7.5 (High), this vulnerability can be exploited remotely with low attack complexity, resulting in high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.