What is CVE-2026-42955?

CVE-2026-42955 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. Extra fix for CVE-2026-40622 to also clamp the TTL of A/AAAA records disallowing a one-time 'ghost domain' delegation renewal via glue records

Which CVE IDs does CVE-2026-42955 cover?

CVE-2026-42955 covers the following CVE IDs: CVE-2026-42955. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-42955?

CVE-2026-42955 has a CVSS v3 base score of 3.7, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-42955?

CVE-2026-42955 affects 1 product, including: azl3 unbound 1.25.1-1 on Azure Linux 3.0.

CVE-2026-42955LowCVSS 3.7

Extra fix for CVE-2026-40622 to also clamp the TTL of A/AAAA records disallowing a one-time 'ghost domain' delegation renewal via glue records

Vendor

Microsoft Security Response Center (MSRC)

Published

July 23, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-42955 →

🎯 Affected products1

azl3 unbound 1.25.1-1 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.25.2-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42955
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade