CVE-2026-34757: 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

Overview

Severity

Medium (CVSS 5.1)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-12

Last Updated

2026-05-19

EPSS Score

0.01% (percentile: 0.5%)

Affected Products (8)

Other

• 19626-17084
• 16848-17084
• 20813-17086
• 18434-17086

Open Source Software

• cbl2 tensorflow 2.11.1-2 on CBL Mariner 2.0
• azl3 tensorflow 2.16.1-11 on Azure Linux 3.0
• azl3 libpng 1.6.56-1 on Azure Linux 3.0
• cbl2 libpng 1.6.56-1 on CBL Mariner 2.0

Revision History

• 2026-04-12: Information published.
• 2026-04-13: Information published.
• 2026-04-15: Information published.
• 2026-05-03: Information published.
• 2026-05-04: Information published.
• 2026-05-19: Information published.