Vulnerability DatabaseCVE-2026-33699
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CVE-2026-33699
March 26, 2026
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.
Affected Packages
pypdf (CONDA):
Affected version(s) >=3.2.0 <6.9.2
Fix Suggestion:
Update to version 6.9.2
pypdf (CONDA):
Affected version(s) >=3.2.0 <6.9.2
Fix Suggestion:
Update to version 6.9.2
pypdf (CONDA):
Affected version(s) >=3.2.0 <6.9.2
Fix Suggestion:
Update to version 6.9.2
https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=v1.17 <6.9.2
Fix Suggestion:
Update to version 6.9.2
https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=v1.17 <6.9.2
Fix Suggestion:
Update to version 6.9.2
https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=v1.17 <6.9.2
Fix Suggestion:
Update to version 6.9.2
pypdf (PYTHON):
Affected version(s) >=1.0 <6.9.2
Fix Suggestion:
Update to version 6.9.2
pypdf (PYTHON):
Affected version(s) >=1.0 <6.9.2
Fix Suggestion:
Update to version 6.9.2
pypdf (PYTHON):
Affected version(s) >=1.0 <6.9.2
Fix Suggestion:
Update to version 6.9.2
pypdf (PYTHON):
Affected version(s) >=1.0 <6.9.2
Fix Suggestion:
Update to version 6.9.2
Related Resources (5)
https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
https://github.com/py-pdf/pypdf/releases/tag/6.9.2
https://nvd.nist.gov/vuln/detail/CVE-2026-33699
https://github.com/py-pdf/pypdf/pull/3693
https://github.com/py-pdf/pypdf
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CVSS v4
Base Score:
4.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
UNREPORTED
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-835
EPSS
Base Score:
0.04