Excessive Iteration in PyPDF - CVE-2026-71852
Published: August 7, 2026 / Updated: August 8, 2026
Vulnerability identifier: #VU141287
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: CVE-2026-71852
CWE-ID: CWE-834
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 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.
Affected software
PyPDF
How to mitigate CVE-2026-71852
Install security update from vendor's website.
PyPDF - update to 6.15.0