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Published: 30 June 2023

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. An attacker who uses this vulnerability can craft a PDF which leads to unexpected long runtime. This quadratic runtime blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. This issue has been addressed in PR 808 and versions from 1.27.9 include this fix. Users are advised to upgrade. There are no known workarounds for this vulnerability.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
Released (1.26.0-2ubuntu0.1~esm2)
Available with Ubuntu Pro
Released (1.26.0-3ubuntu1.20.04.2)
Released (1.26.0-4ubuntu0.22.04.2)
kinetic Ignored
(end of life, was needs-triage)
lunar Not vulnerable
trusty Ignored
(end of standard support)
upstream Needs triage

Released (1.25.1-1ubuntu0.1~esm2)
Available with Ubuntu Pro

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H