CVE-2025-62708: PYSEC-2026-1831 - pypdf can exhaust RAM via manipulated LZWDecode streams

CVE-2025-62708 · Severity: high · CVSS 7.5 · Published 2025-10-22

pypdf is a free and open-source pure-python PDF library. Prior to version 6.1.3, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter. This has been fixed in pypdf version 6.1.3.

Technologies: Pypdf Project Pypdf, pypdf (PyPI). Vendors: Pypdf Project, PyPI.

Quick answers

Is CVE-2025-62708 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-62708 being exploited in the wild.
How severe is CVE-2025-62708?
High severity, with a CVSS score of 7.5, published 22 October 2025.
Which products and versions are affected?
pypdf (PyPI) ECOSYSTEM:introduced=0,fixed=6.1.3.
Is there a fix for CVE-2025-62708?
Yes. pypdf (PyPI): upgrade to 6.1.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-62708?
Check whether you run Pypdf Project Pypdf or pypdf (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

  • pypdf (PyPI): upgrade to 6.1.3 or later
    pip install "pypdf>=6.1.3"

Affected products

  • Pypdf Project Pypdf
  • pypdf (PyPI) ECOSYSTEM:introduced=0,fixed=6.1.3

Identifiers

  • CVE-2025-62708
  • GHSA-jfx9-29x2-rv3j
  • PYSEC-2026-1831

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