GitHub security advisory (AV26-956)

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        <div><p><strong>Serial Number: </strong>AV26-956<br /><strong>Date: </strong>September 23, 2026</p>

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.

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Article Link: GitHub security advisory (AV26-956) - Canadian Centre for Cyber Security