PYSEC-2026-921

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/simplejson/PYSEC-2026-921.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-921
Aliases
Published
2026-07-06T08:03:23.234177Z
Modified
2026-07-07T11:56:05.213425072Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
simplejson before 2.6.1 vulnerable to array index error
Details

Array index error in the scanstring function in the json module in Python 2.7 through 3.5 and simplejson before 2.6.1 allows context-dependent attackers to read arbitrary process memory via a negative index value in the idx argument to the rawdecode function.

References

Affected packages

PyPI / simplejson

Package

Name
simplejson
View open source insights on deps.dev
Purl
pkg:pypi/simplejson

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.6.1

Affected versions

1.*
1.1
1.3
1.4
1.5
1.6
1.7
1.7.1
1.7.2
1.7.3
1.7.4
1.7.5
1.8
1.8.1
1.9
1.9.1
1.9.2
1.9.3
2.*
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9
2.1.0rc3
2.1.0
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.2.0
2.2.1
2.3.0
2.3.1
2.3.2
2.3.3
2.4.0
2.5.0
2.5.1
2.5.2
2.6.0

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/simplejson/PYSEC-2026-921.yaml"