PT-2026-34562 · Py Pdf · Pypdf

Published 2026-04-22 · Updated 2026-04-22 · CVE-2026-41168

Mitre

CVSS v4.0

6.9

Medium

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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.

Fix

Weakness Enumeration

CWE-834

Related Identifiers

CVE-2026-41168

Affected Products

Pypdf

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-41168 · Security Note
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx · Note
• https://github.com/py-pdf/pypdf/pull/3733 · Note
• https://github.com/py-pdf/pypdf/releases/tag/6.10.1 · Note
• https://github.com/py-pdf/pypdf/commit/62338e9d36419cf193ccec7331784f45df1d70b3 · Note