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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
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 62.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

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
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Weaknesses

CWE-835

Affected Products

Red Hat Inc.
commercial·USaka red hat
Red Hat OpenShift LightspeedOn-prem
Operating Systems / linux-distro
Red Hat Enterprise Linux AIOn-prem
Operating Systems / linux-distro
Ansible Automation PlatformOn-prem
Operating Systems / linux-distro
Lightspeed CoreOn-prem
Operating Systems / linux-distro
Red Hat OpenShift AIOn-prem
Operating Systems / linux-distro
py-pdf
package-ecosystemaka pypdf, pypdf2
pypdfOn-prem
OSS Libraries / pypi
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
Сообщество свободного программного обеспечения
oss-projectaka fsf
PyPDFLibraryLibrary
OSS Libraries / generic-library
pypdf project
oss-project
pypdfLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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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 →

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