CVE-2026-41313

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.

Score

CVSS 3.1 6.5 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-04-22

Last modified

2026-04-23

Weaknesses

CWE-834

Affected products

• Pypdf (Py-pdf)
• Pypdf (Pypdf Project)

References

• https://github.com/py-pdf/pypdf/commit/c50a0104cf083356f7c7f5d61410466a57f5c88a
• https://github.com/py-pdf/pypdf/pull/3735
• https://github.com/py-pdf/pypdf/releases/tag/6.10.2
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-4pxv-j86v-mhcw