ST-2026-190 · Platform & version lifecycle
GitHub Enterprise Server 3.17 support ends on 25 August
GitHub documents 25 August 2026 as the closing-down date for GitHub Enterprise Server 3.17, after which the release is unsupported and will receive no further patch releases, including critical security patches.
Previous state
GitHub Enterprise Server 3.17 remains within GitHub's supported release window and can receive supported patch releases through its documented lifecycle.
Current state
On 25 August 2026, GitHub Enterprise Server 3.17 reaches its documented closing-down date; GitHub states discontinued releases are unsupported and receive no further patches, even for critical security issues.
Affected users
Who needs to care
Organizations still operating GitHub Enterprise Server 3.17 instances after 25 August 2026.
Required response
What to do
Plan and validate an upgrade from GitHub Enterprise Server 3.17 to a supported release before 25 August, following GitHub's supported upgrade path and prerequisites.
Evidence boundary
What the source does not prove
The lifecycle boundary is support and patch availability. The cited documentation does not say that already-deployed 3.17 instances stop running on 25 August 2026.
Lifecycle history
Dated event sequence
- GitHub Enterprise Server 3.17 released
GitHub lists 3 June 2025 as the 3.17 release date.
- 3.17 support ends
GitHub lists 25 August 2026 as the closing-down date; discontinued releases are unsupported and receive no patches.
Evidence ledger
First-party sources
- 01GitHub Docs — GitHub Enterprise Server releases
Official GitHub Enterprise Server lifecycle documentation · 2025-06-03
Open official source ↗