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CVE Vulnerability Details :
CVE-2026-27628
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-25 Feb, 2026 | 02:45
Updated At-27 Feb, 2026 | 19:49
Rejected At-
▼CVE Numbering Authority (CNA)
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams

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.

Affected Products
Vendor
py-pdf
Product
pypdf
Versions
Affected
  • < 6.7.2
Problem Types
TypeCWE IDDescription
CWECWE-835CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Type: CWE
CWE ID: CWE-835
Description: CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Metrics
VersionBase scoreBase severityVector
4.01.2LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
Version: 4.0
Base score: 1.2
Base severity: LOW
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/py-pdf/pypdf/security/advisories/GHSA-2rw7-x74f-jg35
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/issues/3654
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/f0a462d36971cf077d74492a348d0d06fd60ea4d
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/security/advisories/GHSA-2rw7-x74f-jg35
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/py-pdf/pypdf/issues/3654
Resource:
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/commit/f0a462d36971cf077d74492a348d0d06fd60ea4d
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/py-pdf/pypdf/issues/3654
exploit
Hyperlink: https://github.com/py-pdf/pypdf/issues/3654
Resource:
exploit
Details not found