CVE-2023-36807: PYSEC-2026-1836 - PyPDF2 vulnerable to possible Infinite Loop when reading malformed objects

CVE-2023-36807 · Severity: low · CVSS 3.1 · Published 2026-07-07

PyPDF2 vulnerable to possible Infinite Loop when reading malformed objects

Technologies: pypdf2 (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2023-36807 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2023-36807 being exploited in the wild.
How severe is CVE-2023-36807?
Low severity, with a CVSS score of 3.1, published 7 July 2026.
Which products and versions are affected?
pypdf2 (PyPI) ECOSYSTEM:introduced=2.10.5,fixed=2.10.6.
Is there a fix for CVE-2023-36807?
Yes. pypdf2 (PyPI): upgrade to 2.10.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2023-36807?
Check whether you run pypdf2 (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • pypdf2 (PyPI): upgrade to 2.10.6 or later
    pip install "pypdf2>=2.10.6"

Affected products

  • pypdf2 (PyPI) ECOSYSTEM:introduced=2.10.5,fixed=2.10.6

Identifiers

  • CVE-2023-36807
  • GHSA-hm9v-vj3r-r55m
  • PYSEC-2026-1836

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