CVE-2026-54651

EUVD-2026-38358
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.
Infinite Loop
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.5 MEDIUM
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 1.49%
Affected Products (NVD)
VendorProductVersion
pypdf_projectpypdf
𝑥
< 6.13.1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
pypdf
bookworm
postponed
forky
vulnerable
sid
vulnerable
trixie
no-dsa
pypdf2
bookworm
postponed
bullseye
postponed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
pypdf
jammy
dne
noble
needs-triage
questing
ignored
resolute
needs-triage
pypdf2
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
dne
resolute
dne
python-pypdf
jammy
dne
noble
dne
questing
dne
resolute
dne
Common Weakness Enumeration
References
https://github.com/py-pdf/pypdf/pull/3839
https://github.com/py-pdf/pypdf/releases/tag/6.13.1
https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9xf-7f8q-9mcj