CVE-2023-36810

Name	CVE-2023-36810
Description	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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3497-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
pypdf2 (PTS)	buster	1.26.0-2	vulnerable
	buster (security)	1.26.0-2+deb10u2	fixed
	bullseye	1.26.0-4	vulnerable
	bookworm	2.12.1-3+deb12u1	fixed
	sid	2.12.1-4	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
pypdf2	source	buster	1.26.0-2+deb10u2		DLA-3497-1
pypdf2	source	(unstable)	1.27.9-1

Notes

[bullseye] - pypdf2 <no-dsa> (Minor issue)
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jrm6-h9cq-8gqw
https://github.com/py-pdf/pypdf/issues/582
https://github.com/py-pdf/pypdf/pull/808
Fixed by: https://github.com/py-pdf/pypdf/commit/c6c56f550bb384e05f0139c796ba1308837d6373 (1.27.9)