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
2026-07-06T08:03:23Z
Modified
2026-07-07T11:56:05Z
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 raw_decode 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
0 Unknown 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"