high7.5
CVE-2025-55197
PyPDF's Manipulated FlateDecode streams can exhaust RAM
Impact
### 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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.0.0 | 6.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143
- https://github.com/py-pdf/pypdf/issues/3429
- https://github.com/py-pdf/pypdf/pull/3430
- https://github.com/py-pdf/pypdf/releases/tag/6.0.0
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m
- https://github.com/advisories/GHSA-7hfw-26vp-jp8m
- https://nvd.nist.gov/vuln/detail/CVE-2025-55197