GHSA-7hfw-26vp-jp8m
PyPDF's Manipulated FlateDecode streams can exhaust RAM
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
### 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](https://github.com/py-pdf/pypdf/releases/tag/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.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m
- https://nvd.nist.gov/vuln/detail/CVE-2025-55197
- https://github.com/py-pdf/pypdf/issues/3429
- https://github.com/py-pdf/pypdf/pull/3430
- https://github.com/py-pdf/pypdf
- https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143
- https://github.com/py-pdf/pypdf/releases/tag/6.0.0