Vulnerability in Py-pdf Pypdf

CVE-2026-41168

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size`…

EPSS: 0.003 (21.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-41168?
CVE-2026-41168 is a medium-severity vulnerability in Py-pdf Pypdf, classified under Excessive Iteration. CVSS score: 5.3/10. Published 2026-04-22.
How severe is CVE-2026-41168?
Medium severity. CVSS v3 base score is 5.3 out of 10.