CVE-2026-33699

moderate-risk
Published 2026-03-27

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.

Do I need to act?

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0.05% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Pypdf Project

References (3)

Issue Tracking https://github.com/py-pdf/pypdf/pull/3693
Product https://github.com/py-pdf/pypdf/releases/tag/6.9.2
Patch https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
31
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal