GitHub security advisory (AV26-720)

Serial number: AV26-720
Date: July 20, 2026

On July 16, 2026, GitHub published security advisories to address vulnerabilities in the following products:

  • GitHub Enterprise Server – versions 3.21.x prior to 3.21.3
  • GitHub Enterprise Server – versions 3.20.x prior to 3.20.5
  • GitHub Enterprise Server – versions 3.19.x prior to 3.19.9
  • GitHub Enterprise Server – versions 3.18.x prior to 3.18.12
  • GitHub Enterprise Server – versions 3.17.x prior to 3.17.18

The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.

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