Moderate severityNVD Advisory· Published Aug 13, 2025· Updated Aug 14, 2025
pypdf's Manipulated FlateDecode streams can exhaust RAM
CVE-2025-55197
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pypdfPyPI | < 6.0.0 | 6.0.0 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
7- github.com/advisories/GHSA-7hfw-26vp-jp8mghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-55197ghsaADVISORY
- github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.pyghsax_refsource_MISCWEB
- github.com/py-pdf/pypdf/issues/3429ghsax_refsource_MISCWEB
- github.com/py-pdf/pypdf/pull/3430ghsax_refsource_MISCWEB
- github.com/py-pdf/pypdf/releases/tag/6.0.0ghsax_refsource_MISCWEB
- github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8mghsax_refsource_CONFIRMWEB
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