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CVE-2026-96642

CVE-2026-96642 · Pillow: TarIO negative size field causes infinite CPU-spin loop

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

Pillow is a Python imaging library. Prior to 13.0.0, the TarIO initializer in src/PIL/TarIO.py accepts a negative octal member size and computes a backward seek that returns to the same 512-byte header. When the requested member name does not match, the parser repeatedly reads that header, consumes a full CPU core, and never returns. TarIO is reached only when an application directly uses PIL.TarIO.TarIO rather than the default Image.open() path. This issue is fixed in version 13.0.0.

CVSS 7.1 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • pillow

    Versions
    • < 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
    • 1.0
    • 1.1
    • 1.2
    • 1.3
    • 1.4
    • 1.5
    • 1.6
    • 1.7.0
    • 1.7.1
    • 1.7.2
    • 1.7.3
    • 1.7.4
    • 1.7.5
    • 1.7.6
    • 1.7.7
    • 1.7.8
    • 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
    • 2.0.0
    • 2.1.0
    • 2.2.0
    • 2.2.1
    • 2.2.2
    • 2.3.0
    • 2.3.1
    • 2.3.2
    • 2.4.0
    • 2.5.0
    • 2.5.1
    • 2.5.2
    • 2.5.3
    • 2.6.0
    • 2.6.1
    • 2.6.2
    • 2.7.0
    • 2.8.0
    • 2.8.1
    • 2.8.2
    • 2.9.0
    • 3.0.0
    • 3.1.0
    • 3.1.0.rc1
    • 3.1.0rc1
    • 3.1.1
    • 3.1.2
    • 3.2.0
    • 3.3.0
    • 3.3.1
    • 3.3.2
    • 3.3.3
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 4.0.0
    • 4.1.0
    • 4.1.1
    • 4.2.0
    • 4.2.1
    • 4.3.0
    • 5.0.0
    • 5.1.0
    • 5.2.0
    • 5.3.0
    • 5.4.0
    • 5.4.0.dev0
    • 5.4.1
    • 6.0.0
    • 6.1.0
    • 6.2.0
    • 6.2.1
    • 6.2.2
    • 7.0.0
    • 7.1.0
    • 7.1.1
    • 7.1.2
    • 7.2.0
    • 8.0.0
    • 8.0.1
    • 8.1.0
    • 8.1.1
    • 8.1.2
    • 8.2.0
    • 8.3.0
    • 8.3.1
    • 8.3.2
    • 8.4.0
    • 9.0.0
    • 9.0.1
    • 9.1.0
    • 9.1.1
    • 9.2.0
    • 9.3.0
    • 9.4.0
    • 9.5.0
    Affected ranges
    • ECOSYSTEM: < 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

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