py-pdf/pypdf · Security
PyPDF's Manipulated FlateDecode streams can exhaust RAM
- GHSA ID
- GHSA-7hfw-26vp-jp8m
- CVE ID
- CVE-2025-55197
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.6 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Description
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.
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.
CWEs
- CWE-400 · Uncontrolled Resource Consumption
- CWE-770 · Allocation of Resources Without Limits or Throttling
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m ↗
- https://github.com/py-pdf/pypdf/issues/3429 ↗
- https://github.com/py-pdf/pypdf/pull/3430 ↗
- https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.0.0 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2025-55197 ↗
- https://github.com/advisories/GHSA-7hfw-26vp-jp8m ↗