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CVE-2026-34757

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.

CVSS 5.1 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • libpng

    Versions
    • >= 1.0.9, < 1.6.57: Affected

    No fix published

  • libpng1.6 Debian:12

    Versions
    • 1.6.39-2
    • 1.6.39-2+deb12u1
    • 1.6.39-2+deb12u2
    • 1.6.39-2+deb12u3
    • 1.6.39-2+deb12u4
    Affected ranges
    • ECOSYSTEM: < 1.6.39-2+deb12u5

    Update to 1.6.39-2+deb12u5

  • libpng1.6 Debian:13

    Versions
    • 1.6.48-1
    • 1.6.48-1+deb13u1
    • 1.6.48-1+deb13u2
    • 1.6.48-1+deb13u3
    • 1.6.48-1+deb13u4
    Affected ranges
    • ECOSYSTEM: < 1.6.48-1+deb13u5

    Update to 1.6.48-1+deb13u5

  • libpng1.6 Debian:14

    Versions
    • 1.6.48-1
    • 1.6.49-1~exp1
    • 1.6.50-1
    • 1.6.50-1~exp1
    • 1.6.51-1
    • 1.6.52-1
    • 1.6.53-1
    • 1.6.54-1
    • 1.6.55-1
    • 1.6.56-1
    Affected ranges
    • ECOSYSTEM: < 1.6.57-1

    Update to 1.6.57-1

  • libpng Ubuntu:Pro:14.04:LTS

    Versions
    • 1.2.49-4ubuntu1
    • 1.2.49-5ubuntu1
    • 1.2.50-1ubuntu1
    • 1.2.50-1ubuntu2
    • 1.2.50-1ubuntu2.14.04.1
    • 1.2.50-1ubuntu2.14.04.2
    • 1.2.50-1ubuntu2.14.04.3
    • 1.2.50-1ubuntu2.14.04.3+esm1
    Affected ranges
    • ECOSYSTEM: < 1.2.50-1ubuntu2.14.04.3+esm2

    Update to 1.2.50-1ubuntu2.14.04.3+esm2

  • libpng Ubuntu:Pro:16.04:LTS

    Versions
    • 1.2.51-0ubuntu3
    • 1.2.54-1
    • 1.2.54-1ubuntu1
    • 1.2.54-1ubuntu1.1
    • 1.2.54-1ubuntu1.1+esm1
    • 1.2.54-1ubuntu1.1+esm2
    Affected ranges
    • ECOSYSTEM: < 1.2.54-1ubuntu1.1+esm3

    Update to 1.2.54-1ubuntu1.1+esm3

  • libpng1.6 Ubuntu:Pro:16.04:LTS

    Versions
    • 1.6.20-2
    • 1.6.20-2ubuntu0.1~esm1
    • 1.6.20-2ubuntu0.1~esm2
    • 1.6.20-2ubuntu0.1~esm3
    Affected ranges
    • ECOSYSTEM: < 1.6.20-2ubuntu0.1~esm4

    Update to 1.6.20-2ubuntu0.1~esm4

  • libpng1.6 Ubuntu:Pro:18.04:LTS

    Versions
    • 1.6.34-1
    • 1.6.34-1ubuntu0.18.04.1
    • 1.6.34-1ubuntu0.18.04.2
    • 1.6.34-1ubuntu0.18.04.2+esm1
    • 1.6.34-1ubuntu0.18.04.2+esm2
    Affected ranges
    • ECOSYSTEM: < 1.6.34-1ubuntu0.18.04.2+esm3

    Update to 1.6.34-1ubuntu0.18.04.2+esm3

  • libpng1.6 Ubuntu:Pro:20.04:LTS

    Versions
    • 1.6.37-1
    • 1.6.37-2
    • 1.6.37-2ubuntu0.1~esm1
    • 1.6.37-2ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: < 1.6.37-2ubuntu0.1~esm3

    Update to 1.6.37-2ubuntu0.1~esm3

  • libpng1.6 Ubuntu:22.04:LTS

    Versions
    • 1.6.37-3build4
    • 1.6.37-3build5
    • 1.6.37-3ubuntu0.1
    • 1.6.37-3ubuntu0.3
    • 1.6.37-3ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 1.6.37-3ubuntu0.5

    Update to 1.6.37-3ubuntu0.5

  • libpng1.6 Ubuntu:24.04:LTS

    Versions
    • 1.6.40-1
    • 1.6.40-2
    • 1.6.40-3
    • 1.6.42-1
    • 1.6.43-1
    • 1.6.43-3
    • 1.6.43-5build1
    • 1.6.43-5ubuntu0.1
    • 1.6.43-5ubuntu0.3
    • 1.6.43-5ubuntu0.4
    • 1.6.43-5ubuntu0.5
    Affected ranges
    • ECOSYSTEM: < 1.6.43-5ubuntu0.6

    Update to 1.6.43-5ubuntu0.6

  • libpng1.6 Ubuntu:25.10

    Versions
    • 1.6.47-1.1
    • 1.6.48-1
    • 1.6.49-1~exp1
    • 1.6.50-1~exp1
    • 1.6.50-1
    • 1.6.50-1ubuntu0.1
    • 1.6.50-1ubuntu0.3
    • 1.6.50-1ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 1.6.50-1ubuntu0.5

    Update to 1.6.50-1ubuntu0.5

Original sources

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