Excessive Iteration in PyPDF - #VU132046
Published: May 21, 2026
Vulnerability identifier: #VU132046
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-834
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Pypdf Project
Affected software:
PyPDF
PyPDF
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to excessive iteration in cross-reference stream processing when parsing a crafted PDF file. A remote attacker can supply a PDF with zero-only width values and a large size value to cause a denial of service.
Exploitation requires cross-reference streams with /W [0 0 0] values and large /Size values.
Remediation
Install security update from vendor's website.