CVE-2026-33699
HIGHpypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/pull/3693
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/releases/tag/6.9.2
Scores
CVSS v3
7.5
EPSS
0.0046
EPSS Percentile
35.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-835
Status
published
Products (3)
py-pdf/pypdf
< 6.9.2
pypdf_project/pypdf
< 6.9.2
pypi/pypdf
0 - 6.9.2PyPI
Published
Mar 27, 2026
Tracked Since
Mar 27, 2026