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Medium ALAS2-2026-3266 1 CVE

Moderate: libpng security update (Amazon Linux 2)

Published Apr 27, 2026 · Updated Apr 29, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-34757: Use-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST in libpng before 1.6.57. Passing a pointer returned by the corresponding getter back into the setter causes the setter to read from a stale pointer after freeing the internal buffer, leading to corrupted chunk data and potential heap information disclosure.

Fixed packages 4

ReleasePackageFixed in
Amazon Linux · 2 libpng 2:1.5.13-8.amzn2.0.9
Amazon Linux · 2 libpng-debuginfo 2:1.5.13-8.amzn2.0.9
Amazon Linux · 2 libpng-devel 2:1.5.13-8.amzn2.0.9
Amazon Linux · 2 libpng-static 2:1.5.13-8.amzn2.0.9

Vulnerabilities 1

  • Medium 5.1
    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

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the …

    pnggroup libpng openjpeg2 fltk Debian Ubuntu Azure Linux Alpine Wolfi

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-34757.html