Improper input validation in PyPDF - CVE-2023-36807
Published: April 10, 2026
Vulnerability identifier: #VU125812
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-36807
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in read_object when parsing malformed PDF objects. A remote attacker can supply a specially crafted PDF to cause a denial of service.
The issue can trigger an infinite loop that blocks the current process and can consume a single CPU core at 100%.
Affected software
PyPDF
How to mitigate CVE-2023-36807
Install security update from vendor's website.
PyPDF - update to 2.10.6