CVE-2026-33123

Name	CVE-2026-33123
Description	pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1131479

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
pypdf (PTS)	bookworm	3.4.1-1+deb12u1	vulnerable
	trixie	5.4.0-1	vulnerable
	forky, sid	6.9.0-1	vulnerable
pypdf2 (PTS)	bullseye	1.26.0-4+deb11u1	vulnerable
	bookworm	2.12.1-3+deb12u1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
pypdf	source	(unstable)	(unfixed)			1131479
pypdf2	source	(unstable)	(unfixed)

Notes

https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp
https://github.com/py-pdf/pypdf/pull/3686
Fixed by: https://github.com/py-pdf/pypdf/commit/0b5d05de59a055c132b435ee2375bc32ff04d48e (6.9.1)