Resource exhaustion in PyPDF - #VU141290
Published: August 7, 2026
Vulnerability identifier: #VU141290
CSH Severity: Low
CVSS v4: 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]
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 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.
Affected software
PyPDF
Remediation
Install security update from vendor's website.
PyPDF - update to 6.15.0