SB2026102126 - Input validation error in PyPDF
Published: October 21, 2026 Updated: October 23, 2026
Security Bulletin ID
SB2026102126
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2026-113786)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause unintended image parsers to be invoked when a crafted PDF is processed.
The vulnerability exists due to improper input validation in pypdf image loading when loading image data that claims to use the /DCTDecode filter for JPEG data. A remote attacker can craft a PDF containing such image data to cause arbitrary image parsers to be called.
Remediation
Install update from vendor's website.