Bazel 4 · Version Status
Bazel 4 End of Life Date
Bazel 4 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Bazel 4 is past end of life. This version no longer receives security patches. 829 days past EOL — migrate to a supported version immediately.
EOL Date
Jan 31, 2024
829 days past EOL
Latest Release
4.2.4
LTS release
Release Date
Jan 21, 2021
Bazel 4 series
| Version | Latest | EOL Date | Status |
|---|
| → 4 LTS |
4.2.4 |
Jan 31, 2024 |
EOL |
| 5 LTS |
5.4.1 |
Jan 31, 2025 |
EOL |
| 6 LTS |
6.6.0 |
Dec 31, 2025 |
EOL |
| 7 LTS |
7.7.1 |
Dec 31, 2026 |
Active |
| 8 LTS |
8.7.0 |
Dec 31, 2027 |
Active |
| 9 LTS |
9.1.0 |
Dec 31, 2028 |
Active |
What does Bazel 4 end of life mean?
When Bazel 4 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Bazel 4 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Bazel 9 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Bazel 4 reach end of life?
Bazel 4 reached end of life on January 31, 2024. This version is no longer receiving security patches.
Is Bazel 4 still supported?
No. Bazel 4 reached end of life on January 31, 2024 and is no longer receiving security patches.
What should I upgrade to from Bazel 4?
The recommended upgrade from Bazel 4 is
Bazel 9 — the latest actively supported version. Check the
Bazel full timeline for all supported versions.
What are the security risks of running Bazel 4 past EOL?
When Bazel 4 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Bazel should migrate immediately or implement compensating controls.