Resource exhaustion in PyPDF - #VU149047
Published: September 12, 2026
Vulnerability identifier: #VU149047
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the parser for the /Widths entry of TrueType and Type1 fonts when parsing PDF font data. A remote attacker can supply a crafted PDF with unusually large width values to cause a denial of service.
Affected software
PyPDF
Remediation
Install security update from vendor's website.
PyPDF - update to 6.18.1