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CVE-2026-33699

pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

Published: Mar 26, 2026Updated: Apr 1, 2026 Sources: CVE List NVD BDUCWE-835
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 64.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-835

Affected Products

pypdfpy-pdf
On-prem
OSS Libraries / pypi
pypdfpypdf project
Library
OSS Libraries / generic-library
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Red Hat OpenShift LightspeedRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / cloud-platform
Red Hat Enterprise Linux AIRed Hat Inc.
On-premOS
Operating Systems / linux-distro
py-pdfpackage-ecosystemOSS Librariesaka pypdf, pypdf2
pypdf projectoss-projectOSS Libraries
ооо «ред софт»commercialRUOperating Systemsaka red soft
red hat inc.commercialUSOperating Systemsaka red hat
and 4 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
github.com
https://github.com/py-pdf/pypdf/pull/3693
github.com
https://github.com/py-pdf/pypdf/releases/tag/6.9.2
github.com
and 6 more references View all →

Timeline

Published
Mar 26, 2026
Last Updated
Apr 1, 2026

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