PyPDF's Manipulated FlateDecode streams can exhaust RAM

CAO 7.5CVE-2025-55197 · GHSA-7hfw-26vp-jp8m · PYSEC-2026-1830 · Công bố 13/08/2025 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2025-55197 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng pypdf, pypdf (pypdf project).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.48%, cao hơn 41.2% các lỗ hổng khác.
Cách xử lý: cập nhật lên 6.0.0 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
pypdf PyPI	`< 6.0.0`	`6.0.0`
pypdf pypdf_project	`< 6.0.0`	`6.0.0`

Mô tả

Impact

An attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access.

Patches

This has been fixed in pypdf==6.0.0.

Workarounds

If you cannot upgrade yet, you might want to implement the workaround for pypdf.filters.decompress yourself: https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143

References

This issue has been reported in #3429 and fixed in #3430.

Mô tả của NVD

pypdf is a free and open-source pure-python PDF library. Prior to version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. This issue has been fixed in 6.0.0. If an update is not possible, a workaround involves including the fixed code from pypdf.filters.decompress into the existing filters file.