What is CVE-2026-39856?

CVE-2026-39856 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. osslsigncode has an Out-of-Bounds Read via Unvalidated Section Bounds in PE Page Hash Calculation

Which CVE IDs does CVE-2026-39856 cover?

CVE-2026-39856 covers the following CVE IDs: CVE-2026-39856. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-39856?

CVE-2026-39856 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-39856?

CVE-2026-39856 affects 2 products, including: cbl2 osslsigncode 2.7-1 on CBL Mariner 2.0; cbl2 osslsigncode 2.7-1 on CBL-Mariner 2.0.

CVE-2026-39856MediumCVSS 5.5

osslsigncode has an Out-of-Bounds Read via Unvalidated Section Bounds in PE Page Hash Calculation

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-39856 →

🎯 Affected products2

cbl2 osslsigncode 2.7-1 on CBL Mariner 2.0
cbl2 osslsigncode 2.7-1 on CBL-Mariner 2.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-39856
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade