CVE-2025-66019

pypdf manipulated LZWDecode streams can exhaust RAM

CVSS 6.6 MEDIUMEPSS 0.3%CWE-400 CWE-409

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.

CVSS: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

Productos afectados

py-pdf · pypdf

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Referencias

https://aydinnyunus.github.io/2025/12/20/cve-2025-66019-pypdf-lzw-dos/https://github.com/py-pdf/pypdf/commit/96186725e5e6f237129a58a97cd19204a9ce40b2 https://github.com/py-pdf/pypdf/releases/tag/6.4.0 https://github.com/py-pdf/pypdf/security/advisories/GHSA-m449-cwjh-6pw7