# CVE-2025-55197: pypdf: pypdf is a free and open-source pure-python PDF library

CVE-2025-55197 is fixed in pypdf on 1 platform by DEBIAN-CVE-2025-55197 (version 6.9.0-1), released August 13, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-55197
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 13, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pypdf Debian 14 | 6.9.0-1 | [DEBIAN-CVE-2025-55197](https://patchblox.com/security/data/fix/linux/debian-cve-2025-55197.md) | Aug 13, 2025 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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