SB2026080779 - Multiple vulnerabilities in PyPDF
Published: August 7, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Inefficient Algorithmic Complexity (CVE-ID: N/A)
CWE-ID: CWE-407 - Inefficient Algorithmic Complexity
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in read_until_whitespace when parsing a crafted PDF input that lacks whitespace for a long time. A remote attacker can supply a crafted PDF file to cause a denial of service.
2) Excessive Iteration (CVE-ID: N/A)
CWE-ID: CWE-834 - Excessive Iteration
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to excessive iteration in the CID font width range parser when parsing font width entries with unusually large values in a crafted PDF. A remote attacker can trick the victim into opening a crafted PDF to cause a denial of service.
User interaction is required to open or process the crafted PDF, for example during text extraction.
3) Resource exhaustion (CVE-ID: N/A)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause excessive memory consumption.
The vulnerability exists due to uncontrolled resource consumption in the /ToUnicode stream parser when parsing a font /ToUnicode entry with unusually large values. A remote attacker can supply a specially crafted PDF to cause excessive memory consumption.
This can occur during text extraction.
Remediation
Install update from vendor's website.