GitHub security advisory (AV26-956)

Serial Number: AV26-956Date: September 23, 2026 As of September 22, 2026, GitHub is affected by vulnerabilities in the following product: Enterprise Server 3.17.0 Prior to 3.17.21 3.18.0 Prior to 3.18.15 3.19.0 Prior to 3.19.12 3.20.0 Prior to 3.20.8 3.21.0 Prior to 3.21.6 3.22.0 Prior to 3.22.1 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. Release notes - GitHub Enterprise Server 3.17 Docs  Release notes - GitHub Enterprise Server 3.18 Docs Release notes - GitHub Enterprise Server 3.19 Docs Release notes - GitHub Enterprise Server 3.20 Docs Release notes - GitHub Enterprise Server 3.21 Docs Release notes - GitHub Enterprise Server 3.22 Docs GitHub Enterprise Server releases - GitHub Enterprise Server 3.19 Docs