p PatchFirst

CVE-2026-112898

CVE-2026-112898 · Pillow: Image.quantize() with empty palette leaks uninitialized stack memory

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

Pillow is a Python imaging library. From 9.1.0 until 13.0.0, Pillow can disclose uninitialized stack memory when Image.quantize() uses an empty palette. ImagingPaletteCacheUpdate() leaves a local cache array uninitialized when the palette has zero entries, and the conversion path emits those bytes as output pixel indices. An attacker who controls the palette image can obtain stack contents from a returned PNG or GIF. This can disclose addresses and stack-canary data without an out-of-bounds access, memory corruption, or process crash. This issue is fixed in version 13.0.0.

CVSS 6.9 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • pillow

    Versions
    • >= 9.1.0, < 13.0.0: Affected

    No fix published

  • pillow Debian:12

    Versions
    • 10.0.0-1
    • 10.1.0-1
    • 10.2.0-1
    • 10.3.0-1
    • 10.3.0-2
    • 10.4.0-1
    • 10.4.0-1.1
    • 11.1.0-1
    • 11.1.0-2
    • 11.1.0-3
    • 11.1.0-4
    • 11.1.0-5
    • 11.2.1-1
    • 11.3.0-1
    • 12.0.0-1
    • 12.1.0-1
    • 12.1.1-1
    • 12.1.1-2
    • 12.2.0-1
    • 12.3.0-1
    • 13.0.0-1
    • 9.4.0-1.1
    • 9.4.0-1.1+deb12u1
    • 9.5.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Debian:13

    Versions
    • 11.1.0-5
    • 11.1.0-5+deb13u1
    • 11.1.0-5+deb13u2
    • 11.1.0-5+deb13u3
    • 11.1.0-5+deb13u4
    • 11.2.1-1
    • 11.3.0-1
    • 12.0.0-1
    • 12.1.0-1
    • 12.1.1-1
    • 12.1.1-2
    • 12.2.0-1
    • 12.3.0-1
    • 13.0.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Debian:14

    Versions
    • 11.1.0-5
    • 11.2.1-1
    • 11.3.0-1
    • 12.0.0-1
    • 12.1.0-1
    • 12.1.1-1
    • 12.1.1-2
    • 12.2.0-1
    • 12.3.0-1
    • 13.0.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow PyPI

    Versions
    • 10.0.0
    • 10.0.1
    • 10.1.0
    • 10.2.0
    • 10.3.0
    • 10.4.0
    • 11.0.0
    • 11.1.0
    • 11.2.1
    • 11.3.0
    • 12.0.0
    • 12.1.0
    • 12.1.1
    • 12.2.0
    • 12.3.0
    • 9.1.0
    • 9.1.1
    • 9.2.0
    • 9.3.0
    • 9.4.0
    • 9.5.0
    Affected ranges
    • ECOSYSTEM: ≥ 9.1.0, < 13.0.0

    Update to 13.0.0

  • pillow Ubuntu:Pro:14.04:LTS

    Versions
    • 2.2.1-1ubuntu2
    • 2.2.1-2ubuntu1
    • 2.2.1-3ubuntu2
    • 2.2.1-3ubuntu3
    • 2.2.1-3ubuntu4
    • 2.2.1-3ubuntu6
    • 2.3.0-1ubuntu1
    • 2.3.0-1ubuntu2
    • 2.3.0-1ubuntu3
    • 2.3.0-1ubuntu3.2
    • 2.3.0-1ubuntu3.3
    • 2.3.0-1ubuntu3.4
    • 2.3.0-1ubuntu3.4+esm1
    • 2.3.0-1ubuntu3.4+esm2
    • 2.3.0-1ubuntu3.4+esm3
    • 2.3.0-1ubuntu3.4+esm4
    • 2.3.0-1ubuntu3.4+esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Ubuntu:Pro:16.04:LTS

    Versions
    • 2.9.0-1
    • 3.0.0-1
    • 3.0.0-1build1
    • 3.1.0-1
    • 3.1.1-1
    • 3.1.2-0ubuntu1
    • 3.1.2-0ubuntu1.1
    • 3.1.2-0ubuntu1.3
    • 3.1.2-0ubuntu1.4
    • 3.1.2-0ubuntu1.5
    • 3.1.2-0ubuntu1.6
    • 3.1.2-0ubuntu1.6+esm1
    • 3.1.2-0ubuntu1.6+esm2
    • 3.1.2-0ubuntu1.6+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Ubuntu:Pro:18.04:LTS

    Versions
    • 4.1.1-3build2
    • 4.3.0-2ubuntu1
    • 5.0.0-1
    • 5.1.0-1
    • 5.1.0-1ubuntu0.2
    • 5.1.0-1ubuntu0.3
    • 5.1.0-1ubuntu0.4
    • 5.1.0-1ubuntu0.5
    • 5.1.0-1ubuntu0.6
    • 5.1.0-1ubuntu0.7
    • 5.1.0-1ubuntu0.8
    • 5.1.0-1ubuntu0.8+esm1
    • 5.1.0-1ubuntu0.8+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Ubuntu:Pro:20.04:LTS

    Versions
    • 6.1.0-1
    • 6.1.0-1build1
    • 6.2.1-2
    • 7.0.0-4
    • 7.0.0-4build1
    • 7.0.0-4ubuntu0.1
    • 7.0.0-4ubuntu0.2
    • 7.0.0-4ubuntu0.3
    • 7.0.0-4ubuntu0.4
    • 7.0.0-4ubuntu0.5
    • 7.0.0-4ubuntu0.6
    • 7.0.0-4ubuntu0.7
    • 7.0.0-4ubuntu0.8
    • 7.0.0-4ubuntu0.9
    • 7.0.0-4ubuntu0.9+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow-python2 Ubuntu:Pro:20.04:LTS

    Versions
    • 6.2.1-3~build1
    • 6.2.1-3
    • 6.2.1-3ubuntu0.1~esm1
    • 6.2.1-3ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Ubuntu:22.04:LTS

    Versions
    • 8.1.2+dfsg-0.3
    • 9.0.0-1
    • 9.0.1-1
    • 9.0.1-1build1
    • 9.0.1-1ubuntu0.1
    • 9.0.1-1ubuntu0.2
    • 9.0.1-1ubuntu0.3
    • 9.0.1-1ubuntu0.4
    • 9.0.1-1ubuntu0.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Ubuntu:24.04:LTS

    Versions
    • 10.0.0-1
    • 10.1.0-1
    • 10.2.0-1
    • 10.2.0-1build1
    • 10.2.0-1ubuntu1
    • 10.2.0-1ubuntu1.2
    • 10.2.0-1ubuntu1.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Ubuntu:26.10

    Versions
    • 12.1.1-2ubuntu1
    • 12.3.0-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pillow Ubuntu:26.04:LTS

    Versions
    • 11.3.0-1ubuntu1
    • 11.3.0-1ubuntu2
    • 12.0.0-1ubuntu1
    • 12.1.1-1ubuntu1
    • 12.1.1-2ubuntu1
    • 12.1.1-2ubuntu1.1
    • 12.1.1-2ubuntu1.2
    • 12.1.1-2ubuntu1.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →