CVE-2026-41168

MEDIUM

pypdf has possible long runtimes for wrong size values in cross-reference and object streams

Title source: cna

Description

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.

References (4)

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

[X_Refsource_Misc] https://github.com/py-pdf/pypdf/pull/3733

[X_Refsource_Misc] https://github.com/py-pdf/pypdf/commit/62338e9d36419cf193ccec7331784f45df1d70b3

[X_Refsource_Misc] https://github.com/py-pdf/pypdf/releases/tag/6.10.1

Scores

CVSS v4 6.9

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Details

CWE

CWE-834

Status published

Products (1)

py-pdf/pypdf < 6.10.1

Published Apr 22, 2026

Tracked Since Apr 23, 2026