PyPDF's Manipulated FlateDecode streams can exhaust RAM

高 7.5CVE-2025-55197 · GHSA-7hfw-26vp-jp8m · PYSEC-2026-1830 · 13/08/2025 公開 · 17/06/2026 更新

要点

CVE-2025-55197 は pypdf, pypdf (pypdf project) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.48%（全脆弱性の 41.2% より高い）。
対処：6.0.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
pypdf PyPI	`< 6.0.0`	`6.0.0`
pypdf pypdf_project	`< 6.0.0`	`6.0.0`

概要

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.

NVD の説明

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.