SB2026041095 - Resource exhaustion in PyPDF
Published: April 10, 2026
Security Bulletin ID
SB2026041095
Severity
Medium
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) Resource exhaustion (CVE-ID: CVE-2025-55197)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in FlateDecode stream processing when parsing a crafted PDF file. A remote attacker can supply a PDF with a malicious cross-reference stream using a series of FlateDecode filters to cause a denial of service.
Simply reading the file is sufficient for exploitation through a malicious cross-reference stream, while other content streams are affected on explicit access.
Remediation
Install update from vendor's website.