What is CVE-2026-18508?

CVE-2026-18508 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite

Which CVE IDs does CVE-2026-18508 cover?

CVE-2026-18508 covers the following CVE IDs: CVE-2026-18508. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-18508?

CVE-2026-18508 has a CVSS v3 base score of 4.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-18508?

CVE-2026-18508 affects 2 products, including: azl3 tar 1.35-2 on Azure Linux 3.0; azl3 tar 1.35-3 on Azure Linux 3.0.

CVE-2026-18508MediumCVSS 4.4

Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-18508 →

🎯 Affected products2

azl3 tar 1.35-2 on Azure Linux 3.0
azl3 tar 1.35-3 on Azure Linux 3.0

✅ Remediation

Security Update KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18508
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade