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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pypdfPyPI | < 6.0.0 | 6.0.0 |
Affected products
10- osv-coords9 versionspkg:apk/chainguard/nemopkg:apk/chainguard/open-webuipkg:apk/chainguard/open-webui-compatpkg:apk/wolfi/open-webuipkg:apk/wolfi/open-webui-compatpkg:pypi/pypdfpkg:rpm/opensuse/python-PyPDF2&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python-PyPDF2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python-pypdf&distro=openSUSE%20Tumbleweed
< 2.4.0-r11+ 8 more
- (no CPE)range: < 2.4.0-r11
- (no CPE)range: < 0.6.22-r1
- (no CPE)range: < 0.6.22-r1
- (no CPE)range: < 0.6.22-r1
- (no CPE)range: < 0.6.22-r1
- (no CPE)range: < 6.0.0
- (no CPE)range: < 2.11.1-bp160.2.1
- (no CPE)range: < 2.11.1-4.1
- (no CPE)range: < 6.0.0-1.1
Patches
Vulnerability mechanics
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
News mentions
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