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CVE-2026-27024

pypdf has a possible infinite loop when processing TreeObject

Published: Feb 20, 2026Updated: Feb 24, 2026 Sources: CVE List NVD GHSA BDUCWE-835
NVD MITRE
5.5CVSSMEDIUM
EPSS Score
0.2%
Top 93.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
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

Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
OpenShift AIRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / saas-application
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
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
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/commit/bd2f6d052fe5941e85e37082c2a43453d48d1295
github.com
https://github.com/py-pdf/pypdf/pull/3645
github.com
https://github.com/py-pdf/pypdf/security/advisories/GHSA-996q-pr4m-cvgq
github.com
and 11 more references View all →

Timeline

Published
Feb 20, 2026
Last Updated
Feb 24, 2026

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