What is CVE-2026-21620?

CVE-2026-21620 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. TFTP Path Traversal

Which CVE IDs does CVE-2026-21620 cover?

CVE-2026-21620 covers the following CVE IDs: CVE-2026-21620. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-21620?

CVE-2026-21620 affects 4 products, including: azl3 erlang 26.2.5.15-1 on Azure Linux 3.0; cbl2 erlang 25.3.2.21-4 on CBL Mariner 2.0; cbl2 erlang 25.3.2.21-5 on CBL Mariner 2.0; cbl2 erlang 25.3.2.21-5 on CBL-Mariner 2.0.

CVE-2026-21620Low

TFTP Path Traversal

Vendor

Microsoft Security Response Center (MSRC)

Published

February 25, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21620 →

🎯 Affected products4

azl3 erlang 26.2.5.15-1 on Azure Linux 3.0
cbl2 erlang 25.3.2.21-4 on CBL Mariner 2.0
cbl2 erlang 25.3.2.21-5 on CBL Mariner 2.0
cbl2 erlang 25.3.2.21-5 on CBL-Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 26.2.5.17-1 KBCBL-Mariner Releases (Security Update) — fixed build 25.3.2.21-6 KBRelease Notes (Security Update) — fixed build 25.3.2.21-6

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21620
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade