Question 1

What is the EOL Risk Score for Bazel 4?

Accepted Answer

Bazel 4 has an EOL Risk Score™ of 50 out of 100, placing it in the Medium risk band. The score is calculated from four factors: EOL Recency (40/40), Attack Surface (10/30), CISA KEV Exposure (0/20), and Extended Support Availability (0/10).

Question 2

Is Bazel 4 still supported?

Accepted Answer

Bazel 4 is no longer supported — it has passed its end of life date (January 31, 2024). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Bazel 4 reach end of life?

Accepted Answer

Bazel 4 reached (or will reach) end of life on January 31, 2024. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Bazel 4 after end of life?

Accepted Answer

After end of life, Bazel 4 no longer receives security patches. Any newly discovered CVEs remain unpatched indefinitely. Organizations running EOL software also face compliance violations under SOC 2, PCI DSS, HIPAA, and ISO 27001, which require use of supported software versions.