What is CVE-2026-34757?

CVE-2026-34757 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST leading to corrupted chunk data and potential heap information disclosure

Which CVE IDs does CVE-2026-34757 cover?

CVE-2026-34757 covers the following CVE IDs: CVE-2026-34757. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-34757?

CVE-2026-34757 has a CVSS v3 base score of 5.1, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-34757?

CVE-2026-34757 affects 3 products, including: azl3 libpng 1.6.56-1 on Azure Linux 3.0; cbl2 libpng 1.6.56-1 on CBL Mariner 2.0; cbl2 libpng 1.6.56-1 on CBL-Mariner 2.0.

CVE-2026-34757MediumCVSS 5.1

LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST leading to corrupted chunk data and potential heap information disclosure

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-34757 →

🎯 Affected products3

azl3 libpng 1.6.56-1 on Azure Linux 3.0
cbl2 libpng 1.6.56-1 on CBL Mariner 2.0
cbl2 libpng 1.6.56-1 on CBL-Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.6.57-1 KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34757
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade