SB2026041098 - Inefficient Algorithmic Complexity in PyPDF
Published: April 10, 2026
Security Bulletin ID
SB2026041098
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Inefficient Algorithmic Complexity (CVE-ID: CVE-2026-28804)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in the ASCIIHexDecode stream decoder when parsing a crafted PDF stream that uses the /ASCIIHexDecode filter. A remote attacker can supply a specially crafted PDF to cause a denial of service.
Exploitation requires the application to access a stream that uses the /ASCIIHexDecode filter.
Remediation
Install update from vendor's website.