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CVE-2026-27628

pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams

Published: Feb 25, 2026Updated: Feb 27, 2026 Sources: CVE List NVD GHSA BDUCWE-835
7.5HIGH
NVD MITRE
EPSS Score
0.3%
Top 72.8%
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. Prior to 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a workaround, one may apply 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 QuayOn-prem
Operating Systems / linux-distro
Red Hat OpenShift AIOn-prem
Operating Systems / linux-distro
pypdf project
oss-project
pypdfLibrary
OSS Libraries / generic-library
PyPI
package-ecosystem
pypdf
OSS Libraries
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
Matthew Peveler
aka pypdf2
PyPDF2Library
OSS Libraries
py-pdf
package-ecosystemaka pypdf, pypdf2
pypdfOn-prem
OSS Libraries / pypi

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/commit/f0a462d36971cf077d74492a348d0d06fd60ea4d
github.com
https://github.com/py-pdf/pypdf/issues/3654
github.com
https://github.com/py-pdf/pypdf/security/advisories/GHSA-2rw7-x74f-jg35
github.com
and 9 more references View all →

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