CVE-2025-55197

Name	CVE-2025-55197
Description	pypdf is a free and open-source pure-python PDF library. Prior to version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. This issue has been fixed in 6.0.0. If an update is not possible, a workaround involves including the fixed code from pypdf.filters.decompress into the existing filters file.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1111139

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
	forky, sid, trixie	5.4.0-1	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)			1111139
pypdf2	source	(unstable)	(unfixed)

Notes

[trixie] - pypdf <no-dsa> (Minor issue)
[bookworm] - pypdf <no-dsa> (Minor issue)
[bookworm] - pypdf2 <no-dsa> (Minor issue)
[bullseye] - pypdf2 <postponed> (Minor issue)
https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m
https://github.com/py-pdf/pypdf/issues/3429
https://github.com/py-pdf/pypdf/pull/3430
Fixed by: https://github.com/py-pdf/pypdf/commit/bb3a69030fde7da545229438ff327b8c971cef49 (6.0.0)