CVE-2021-33026

CVE-2021-33026 is a critical vulnerability affecting Flask-Caching versions through 1.10.1, where its reliance on Pickle for serialization can lead to remote code execution or local privilege escalation. An attacker with access to the cache storage can inject a malicious payload, poisoning the cache and executing arbitrary Python code. This vulnerability carries a CVSS score of 9.8 (Critical) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While the EPSS score is relatively low, indicating a lower probability of exploitation compared to many CVEs, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.