PT-2026-56527 · Py Pdf · Pypdf

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59937

Mitre

CVSS v4.0

6.9

Medium

Base vector

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

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-59937

Affected Products

Pypdf

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-59937 · Security Note
• https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae · Note
• https://github.com/py-pdf/pypdf/releases/tag/6.14.0 · Note
• https://github.com/py-pdf/pypdf/pull/3887 · Note
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v · Note