GitHub Advisoryadvisory · PyPI

GHSA-7hfw-26vp-jp8m PyPDF's Manipulated FlateDecode streams can exhaust RAM

MEDIUM Published 2025-08-13 Modified 2025-08-14 Official page ↗
Aliases
CVE-2025-55197
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
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
Weaknesses
CWE-400, CWE-770
Reviewed
2025-08-13

Affected packages

• PyPI pypdf: < 6.0.0 → fixed in 6.0.0

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.

Related

Alias · CVE (1)

  • CVE-2025-55197 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (2)

  • CWE-400 Uncontrolled Resource Consumption weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References