What is CVE-2026-42507?

CVE-2026-42507 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Arbitrary inputs are included in errors without any escaping in net/textproto

Which CVE IDs does CVE-2026-42507 cover?

CVE-2026-42507 covers the following CVE IDs: CVE-2026-42507. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-42507?

CVE-2026-42507 has a CVSS v3 base score of 5.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-42507?

CVE-2026-42507 affects 6 products, including: azl3 golang 1.25.10-1 on Azure Linux 3.0; azl3 golang 1.25.11-3 on Azure Linux 3.0; azl3 golang 1.26.3-1 on Azure Linux 3.0; azl3 golang 1.26.4-3 on Azure Linux 3.0; azl3 golang 1.26.5-2 on Azure Linux 3.0; and others — see the full list on the advisory page.

CVE-2026-42507MediumCVSS 5.3

Arbitrary inputs are included in errors without any escaping in net/textproto

Vendor

Microsoft Security Response Center (MSRC)

Published

June 9, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-42507 →

🎯 Affected products6

azl3 golang 1.25.10-1 on Azure Linux 3.0
azl3 golang 1.25.11-3 on Azure Linux 3.0
azl3 golang 1.26.3-1 on Azure Linux 3.0
azl3 golang 1.26.4-3 on Azure Linux 3.0
azl3 golang 1.26.5-2 on Azure Linux 3.0
azl3 golang 1.27.0-1 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.26.4-1 Security Update

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42507
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade