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Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.4.0, an attacker who uses this vulnerability can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter. This issue has been patched in version 6.4.0.

PUBLISHED Reserved 2025-11-21 | Published 2025-11-25 | Updated 2025-11-26 | Assigner GitHub_M




MEDIUM: 6.6CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

Problem types

CWE-400: Uncontrolled Resource Consumption

CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)

Product status

< 6.4.0
affected

References

github.com/.../pypdf/security/advisories/GHSA-m449-cwjh-6pw7

github.com/...ommit/96186725e5e6f237129a58a97cd19204a9ce40b2

github.com/py-pdf/pypdf/releases/tag/6.4.0

cve.org (CVE-2025-66019)

nvd.nist.gov (CVE-2025-66019)

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