What is CVE-2026-59831?

CVE-2026-59831 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. GitHub CLI `gh codespace jupyter` could allow remote code execution when connecting to a malicious Codespace

Which CVE IDs does CVE-2026-59831 cover?

CVE-2026-59831 covers the following CVE IDs: CVE-2026-59831. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-59831?

CVE-2026-59831 has a CVSS v3 base score of 4.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-59831?

CVE-2026-59831 affects 2 products, including: azl3 gh 2.62.0-18 on Azure Linux 3.0; azl3 gh 2.62.0-20 on Azure Linux 3.0.

CVE-2026-59831MediumCVSS 4.4

GitHub CLI `gh codespace jupyter` could allow remote code execution when connecting to a malicious Codespace

Vendor

Microsoft Security Response Center (MSRC)

Published

July 17, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-59831 →

🎯 Affected products2

azl3 gh 2.62.0-18 on Azure Linux 3.0
azl3 gh 2.62.0-20 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 2.62.0-19 KBCBL-Mariner Releases (Security Update) — fixed build 2.62.0-20

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59831
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade