CVE-2026-41168 MEDIUM

CVE-2026-41168: pypdf has possible long runtimes for wrong size values in cross-reference and object streams

Vendor Py-Pdf
Product pypdf
Weakness CWE-834
Published April 22, 2026
Last update April 23, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.

Key dates

02Disclosure timeline

April 22, 2026 CVE published
April 23, 2026 Record updated