CVE-2026-54651

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.

• CWE-835

• https://github.com/py-pdf/pypdf/pull/3839Issue Tracking
• https://github.com/py-pdf/pypdf/releases/tag/6.13.1Patch
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9xf-7f8q-9mcjMitigation, Patch, Vendor Advisory

Published

Jun 22, 2026

Last Modified

Jun 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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