CVE-2026-102997
Published:September 30, 2026
Updated:October 10, 2026
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF containing a partially malformed /FlateDecode stream with padded data can force pypdf/filters.py to use inefficient byte-by-byte decompression while the earlier recovery counter fails to advance for bytes that successfully decode, causing long runtimes and application unavailability. This is a residual issue after the malformed FlateDecode recovery fix. This issue is fixed in version 6.18.1.
Affected Packages
pypdf (CONDA):
Affected version(s) >=6.0.0 <6.18.1Fix Suggestion:
Update to version 6.18.1https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=6.0.0 <6.18.1Fix Suggestion:
Update to version 6.18.1pypdf (PYTHON):
Affected version(s) >=3.1.0 <6.18.1Fix Suggestion:
Update to version 6.18.1Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
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:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.34