CVE-2026-41168

low-risk

Published 2026-04-22

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` values or object streams with wrong large `/N` values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.

Do I need to act?

0.04% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

NETWORK / LOW complexity

Affected Products (1)

Pypdf

Affected Vendors

Pypdf Project

References (4)

Patch https://github.com/py-pdf/pypdf/commit/62338e9d36419cf193ccec7331784f45df1d70b3

Issue Tracking https://github.com/py-pdf/pypdf/pull/3733

Product https://github.com/py-pdf/pypdf/releases/tag/6.10.1

Mitigation https://github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx

/ 100

low-risk

Severity 21/34 · High

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal