CVE-2026-119208
Published:October 29, 2026
Updated:October 30, 2026
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive time and memory when an application accesses the page count of a crafted encrypted PDF whose page tree declares a forged /Count value. Even after successful decryption, page-count retrieval trusts the unvalidated declared count instead of walking the page tree, allowing the attacker-controlled value to drive excessive work and memory use. This issue is fixed in version 6.21.3.
Affected Packages
pypdf (CONDA):
Affected version(s) >=4.0.0 <6.21.3 || >=6.0.0 <6.21.3 || >=5.0.0 <6.21.3 || >=3.2.0 <6.21.3Fix Suggestion:
Update to version 6.21.3https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=v1.17 <6.21.3 || >=1.26.0 <6.21.3 || >=2.0.0 <6.21.3 || >=3.0.0 <6.21.3 || >=4.0.0 <6.21.3 || >=5.0.0 <6.21.3 || >=6.0.0 <6.21.3Fix Suggestion:
Update to version 6.21.3pypdf (PYTHON):
Affected version(s) >=1.0 <6.21.3Fix Suggestion:
Update to version 6.21.3pypdf (PYTHON):
Affected version(s) >=4.0.0 <6.21.3 || >=6.0.0 <6.21.3 || >=5.0.0 <6.21.3 || >=3.1.0 <6.21.3Fix Suggestion:
Update to version 6.21.3Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption