Many legacy functions in 5.6.40 do not have modern memory protections, leading to potential heap or stack overflows when processing maliciously crafted input.
If you absolutely cannot upgrade your code, use a service like CloudLinux or Ubuntu ESM , which provides backported security patches for EOL versions. php version 5.6.40 vulnerabilities
October 2023 Reading Time: 8 Minutes
, meaning it no longer receives official security patches from the Summary of Core Vulnerabilities Many legacy functions in 5
You have three viable paths away from 5.6.40: php version 5.6.40 vulnerabilities
This vulnerability exists in the bcmath extension. While less flashy than RCE, it allows an attacker to cause a denial-of-service (crash) or read small amounts of stack memory. In a shared hosting environment, this can be used to break out of tenant isolation.