# GitHub Actions runner Node 20 glibc 2.28 self-hosted runner upgrade fixes compatibility check exposes older OS glibc incompatibility

Status: search-observed
Product: GitHub Actions runner
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/github-actions-runner-node-20-glibc-2-28-self-hosted-runner-upgrade-fixes-compatibility-check-ex
Machine JSON: https://gitdocs.org/api/fixes/github-actions-runner-node-20-glibc-2-28-self-hosted-runner-upgrade-fixes-compatibility-check-ex.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

The action's host runtime and runner compatibility are supplied by the CI platform, not by the repository's package.json or source tree.

## Fix

```
Verifier executes on the target host matrix and checks a forward-compatible action/runtime change. Check the supported runner/runtime matrix, not just a local Node invocation.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- GitHub Actions runner Node 20 glibc 2.28 self-hosted runner upgrade fixes compatibility check exposes older OS glibc incompatibility
- GitHub Actions Node 20 glibc 2.28 self-hosted runner
- site:github.blog GitHub Actions Node20 runner glibc 2.28
- GitHub Actions Node 20 actions runner operating system glibc
- Node20 actions are only supported on self-hosted runner glibc 2.28
- GitHub Actions Node 20 older operating systems glibc 2.28 ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION
- site:github.blog/changelog GitHub Actions Node 20 self-hosted runner older OS
- https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/
- GitHub Actions Node 20 glibc older OS Node20 action failing GLIBC_2.28
- GitHub Actions Node 24 self-hosted runner glibc 2.28 runner version
- actions checkout v5 node24 runner version v2.327.1

## Sources

- Deprecation of Node 20 on GitHub Actions runners: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/
- Official reference opened by Codex: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/