CVE-2025-55197

MEDIUM EPSS 32.6%
Published Aug 13, 202510mo ago · Modified Jun 17, 20262w ago
6.6 CVSS 4.0
Medium
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Published Aug 13, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.6
Exploitability
—
Impact
—
Vector string
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
32.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-400 Uncontrolled Resource Consumption Resource Mgmt
CWE-770

Affected Products 1

VendorProductVersionRange
pypdf_projectpypdf* <6.0.0

References 5

  • github.com https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143
    Product
  • github.com https://github.com/py-pdf/pypdf/issues/3429
    Issue Tracking
  • github.com https://github.com/py-pdf/pypdf/pull/3430
    Patch
  • github.com https://github.com/py-pdf/pypdf/releases/tag/6.0.0
    Release Notes
  • github.com https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m
    MitigationThird Party Advisory

Remediation

  • github.com https://github.com/py-pdf/pypdf/pull/3430
    Patch