SB20260410111 - Improper input validation in PyPDF
Published: April 10, 2026
Security Bulletin ID
SB20260410111
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2023-36807)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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/E:U/U:Clear
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%.
Remediation
Install update from vendor's website.