CVE-2026-33699: PYSEC-2026-3012 - pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream
CVE-2026-33699 · Severity: high · CVSS 7.5 · 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.
No. Junglewise Threat Intelligence has no report of CVE-2026-33699 being exploited in the wild.
How severe is CVE-2026-33699?
High severity, with a CVSS score of 7.5, published 27 March 2026.
Which products and versions are affected?
pypdf (PyPI) ECOSYSTEM:introduced=0,fixed=6.9.2.
Is there a fix for CVE-2026-33699?
Yes. pypdf (PyPI): upgrade to 6.9.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33699?
Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.