CVE-2026-27888
February 26, 2026
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the "xfa" property of a reader or writer and the corresponding stream being compressed using "/FlateDecode". This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.
Affected Packages
https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=1.26.0 <6.7.3Fix Suggestion:
Update to version 6.7.3pypdf (PYTHON):
Affected version(s) >=1.0 <6.7.3Fix Suggestion:
Update to version 6.7.3Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.6
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
Exploit Maturity
UNREPORTED
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)
Uncontrolled Resource Consumption
EPSS
Base Score:
0.04
