Description
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 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.
References
https://github.com/py-pdf/pypdf/pull/3735
Issue TrackingPatch
https://github.com/py-pdf/pypdf/releases/tag/6.10.2
Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4pxv-j86v-mhcw
PatchVendor Advisory
CVSS impact metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5 · Medium
Information
Source identifier
Vulnerability status
Analyzed
Published
2026-04-22T22:16:32.220Z
5 months agoLast modified
2026-06-17T10:46:29.350Z
3 months ago