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
https://github.com/py-pdf/pypdf/pull/3733
https://github.com/py-pdf/pypdf/releases/tag/6.10.1
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx
CVSS impact metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3 · Medium
Information
Source identifier
Vulnerability status
Analyzed
Published
2026-04-22T21:17:09.450Z
5 months agoLast modified
2026-06-17T10:46:15.960Z
3 months ago