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CVE-2025-55197

CVE-2025-55197 · pypdf's Manipulated FlateDecode streams can exhaust RAM

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

pypdf is a free and open-source pure-python PDF library. Prior to version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. This issue has been fixed in 6.0.0. If an update is not possible, a workaround involves including the fixed code from pypdf.filters.decompress into the existing filters file.

CVSS 6.6 · Medium · EPSS 0.5% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • pypdf

    Versions
    • < 6.0.0: Affected

    No fix published

  • pypdf Debian:12

    Versions
    • 3.17.4-1
    • 3.4.1-1
    • 3.4.1-1+deb12u1
    • 4.0.0-1
    • 4.0.0-1~exp1
    • 4.0.1-1
    • 4.0.2-1
    • 4.1.0-1
    • 4.2.0-1
    • 4.3.1-1
    • 5.4.0-1
    • 6.9.0-1
    • 6.9.2-1
    • 6.9.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf Debian:13

    Versions
    • 5.4.0-1
    • 6.9.0-1
    • 6.9.2-1
    • 6.9.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf Debian:14

    Versions
    • 5.4.0-1
    Affected ranges
    • ECOSYSTEM: < 6.9.0-1

    Update to 6.9.0-1

  • pypdf2 Debian:12

    Versions
    • 2.12.1-3
    • 2.12.1-3+deb12u1
    • 2.12.1-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf PyPI

    Versions
    • 1.0
    • 1.1
    • 1.10
    • 1.11
    • 1.12
    • 1.13
    • 1.2
    • 1.3
    • 1.4
    • 1.5
    • 1.6
    • 1.7
    • 1.8
    • 1.9
    • 3.1.0
    • 3.10.0
    • 3.11.0
    • 3.11.1
    • 3.12.0
    • 3.12.1
    • 3.12.2
    • 3.13.0
    • 3.14.0
    • 3.15.0
    • 3.15.1
    • 3.15.2
    • 3.15.3
    • 3.15.4
    • 3.15.5
    • 3.16.0
    • 3.16.1
    • 3.16.2
    • 3.16.3
    • 3.16.4
    • 3.17.0
    • 3.17.1
    • 3.17.2
    • 3.17.3
    • 3.17.4
    • 3.2.0
    • 3.2.1
    • 3.3.0
    • 3.4.0
    • 3.4.1
    • 3.5.0
    • 3.5.1
    • 3.5.2
    • 3.6.0
    • 3.7.0
    • 3.7.1
    • 3.8.0
    • 3.8.1
    • 3.9.0
    • 3.9.1
    • 4.0.0
    • 4.0.1
    • 4.0.2
    • 4.1.0
    • 4.2.0
    • 4.3.0
    • 4.3.1
    • 5.0.0
    • 5.0.1
    • 5.1.0
    • 5.2.0
    • 5.3.0
    • 5.3.1
    • 5.4.0
    • 5.5.0
    • 5.6.0
    • 5.6.1
    • 5.7.0
    • 5.8.0
    • 5.9.0
    Affected ranges
    • ECOSYSTEM: < 6.0.0

    Update to 6.0.0

  • pypdf2 Ubuntu:Pro:16.04:LTS

    Versions
    • 1.23+git20141008-1
    • 1.25.1-1
    • 1.25.1-1ubuntu0.1~esm1
    • 1.25.1-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf2 Ubuntu:Pro:18.04:LTS

    Versions
    • 1.26.0-2
    • 1.26.0-2ubuntu0.1~esm1
    • 1.26.0-2ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf2 Ubuntu:20.04:LTS

    Versions
    • 1.26.0-2
    • 1.26.0-3ubuntu1
    • 1.26.0-3ubuntu1.20.04.1
    • 1.26.0-3ubuntu1.20.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf2 Ubuntu:22.04:LTS

    Versions
    • 1.26.0-4
    • 1.26.0-4ubuntu0.22.04.1
    • 1.26.0-4ubuntu0.22.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf Ubuntu:24.04:LTS

    Versions
    • 3.4.1-1
    • 3.17.4-1
    • 4.0.0-1
    • 4.0.1-1
    • 4.0.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf2 Ubuntu:24.04:LTS

    Versions
    • 2.12.1-3
    • 2.12.1-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf Ubuntu:25.10

    Versions
    • 4.3.1-1
    • 5.4.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf Ubuntu:26.10

    Versions
    • 6.9.2-1
    • 6.9.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pypdf Ubuntu:26.04:LTS

    Versions
    • 5.4.0-1
    • 6.9.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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