CVE-2026-33123

low-risk
Published 2026-03-20

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Pypdf Project

References (3)

Issue Tracking https://github.com/py-pdf/pypdf/pull/3686
Product https://github.com/py-pdf/pypdf/releases/tag/6.9.1
Patch https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp
29
/ 100
low-risk
Severity 24/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal