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CVE-2025-66019
Published: Nov 25, 2025
Modified: Jan 20, 2026
PUBLISHED
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.
| Vendor | Product | Versions |
|---|---|---|
py-pdf | pypdf | affected < 6.4.0 |
References
https://github.com/py-pdf/pypdf/security/advisories/GHSA-m449-cwjh-6pw7
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/releases/tag/6.4.0
x_refsource_MISC
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