Infinite loop in PyPDF - CVE-2026-54651
Published: June 8, 2026
Vulnerability identifier: #VU133911
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54651
CWE-ID: CWE-835
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 an infinite loop in the writer when merging a PDF file with threads/articles. A remote attacker can supply a specially crafted PDF file to cause a denial of service.
Affected software
PyPDF
How to mitigate CVE-2026-54651
Install security update from vendor's website.
PyPDF - update to 6.13.1