PYSEC-2026-559

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/upsonic/PYSEC-2026-559.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-559
Aliases
Published
2026-06-29T11:50:46Z
Modified
2026-07-01T20:23:10Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Upsonic: remote code execution vulnerability in its MCP server/task creation functionality
Details

Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. The application allows users to define MCP tasks with arbitrary command and args values. Although an allowlist exists, certain allowed commands (npm, npx) accept argument flags that enable execution of arbitrary OS commands. Maliciously crafted MCP tasks may lead to remote code execution with the privileges of the Upsonic process. In version 0.72.0 Upsonic added a warning about using Stdio servers being able to execute commands directly on the machine.

References

Affected packages

PyPI / upsonic

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.72.0

Affected versions

0.*
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6
0.4.7
0.4.8
0.4.9
0.4.10
0.4.11
0.4.12
0.4.13
0.4.14
0.4.15
0.5.0
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.7.0
0.7.1
0.7.2
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.9.0
0.10.0
0.10.1
0.10.2
0.11.0
0.11.1
0.11.2
0.11.3
0.11.4
0.11.5
0.11.6
0.11.7
0.11.8
0.11.9
0.11.10
0.11.11
0.12.0
0.12.1
0.12.2
0.12.3
0.12.4
0.12.5
0.13.0
0.13.1
0.13.2
0.13.3
0.14.0
0.14.1
0.14.2
0.14.3
0.15.0
0.16.0
0.16.1
0.17.0
0.17.1
0.18.0
0.19.0
0.19.1
0.19.2
0.19.3
0.19.4
0.20.0
0.20.1
0.20.2
0.20.3
0.21.0
0.22.0
0.23.0
0.23.1
0.23.2
0.23.3
0.23.4
0.24.0
0.24.1
0.24.2
0.25.0
0.26.0
0.27.0
0.28.0
0.28.1
0.28.2
0.28.3
0.28.4
0.30.0
0.30.2
0.30.7
0.32.0
0.33.1
0.34.0
0.34.1
0.34.2
0.34.3
0.35.0a1736970242
0.35.0a1736970720
0.35.0a1736971149
0.35.0a1736971897
0.35.0a1736972885
0.35.0a1736974243
0.35.0a1736975119
0.35.0a1736976284
0.35.0a1736978167
0.35.0a1736979941
0.35.0a1736981630
0.35.0a1736982287
0.35.0a1736982640
0.35.0a1736983736
0.35.0a1736984772
0.35.0a1736986092
0.35.0a1737010781
0.35.0a1737010942
0.35.0a1737015222
0.35.0a1737016349
0.35.0a1737023679
0.35.0a1737033652
0.35.0a1737033931
0.35.0a1737034519
0.35.0a1737042503
0.35.0a1737042958
0.35.0a1737043600
0.35.0a1737044257
0.35.0a1737044843
0.35.0a1737045225
0.35.0a1737114840
0.35.0a1737114977
0.35.0a1737116875
0.35.0a1737117468
0.35.0a1737122839
0.35.0a1737195981
0.35.0a1737212799
0.35.0a1737217937
0.35.0a1737218956
0.35.0a1737227112
0.35.0a1737311492
0.35.0a1737315034
0.35.0a1737379903
0.36.0a1737396881
0.36.0a1737401408
0.36.0a1737407655
0.36.0a1737409215
0.36.0a1737410849
0.36.0a1737438831
0.36.0a1737457705
0.36.0a1737482268
0.36.0a1737482779
0.36.0a1737487622
0.36.0a1737496270
0.36.0a1737496729
0.36.0a1737498136
0.36.0a1737539419
0.36.0a1737542896
0.36.0a1737628376
0.36.0
0.37.0
0.38.0a1737809635
0.38.0
0.38.1a1738355936
0.38.1
0.39.0a1738407703
0.39.0a1738408485
0.39.0a1738409132
0.39.0a1738413952
0.39.0a1738417207
0.39.0
0.40.0
0.40.1a1738430067
0.40.1a1738431780
0.40.1
0.40.2
0.40.3
0.40.4a1738504324
0.40.4
0.40.5a1738608355
0.40.5a1738609512
0.40.5a1738609921
0.40.5a1738610310
0.40.5a1738610551
0.40.5
0.40.6a1738619561
0.40.6
0.40.7a1738837197
0.40.7a1738851334
0.40.7a1738858117
0.40.7a1738865999
0.40.7a1738874469
0.40.7
0.41.0a1738875992
0.41.0a1738913481
0.41.0a1738922922
0.41.0a1738942849
0.41.0a1738943864
0.41.0a1738947565
0.41.0a1738948334
0.41.0a1738949488
0.41.0a1738951496
0.41.0a1738961482
0.41.0a1739006911
0.41.0
0.41.1
0.42.0a1739015944
0.42.0a1739029428
0.42.0a1739042238
0.42.0a1739042985
0.42.0a1739044180
0.42.0a1739044629
0.42.0a1739047263
0.42.0a1739048896
0.42.0a1739050234
0.42.0a1739093954
0.42.0a1739099062
0.42.0
0.43.0a1739106873
0.43.0a1739383942
0.43.0a1739389035
0.43.0a1739429679
0.43.0
0.44.0a1739451866
0.44.0a1739565955
0.44.0
0.44.1a1739799852
0.44.1a1739881595
0.44.1a1739897729
0.44.1a1739899475
0.44.1a1739904268
0.44.1a1739905596
0.44.1a1739908048
0.44.1a1739909460
0.44.1a1739912278
0.44.1a1739949863
0.44.1a1739953863
0.44.1a1739958116
0.44.1a1739969973
0.44.1a1739983135
0.44.1
0.44.2a1740050593
0.44.2a1740071168
0.44.2a1740084271
0.44.2a1740085443
0.44.2a1740085570
0.44.2
0.45.0
0.45.1
0.45.2
0.45.3
0.45.4
0.46.0
0.46.1
0.47.0
0.47.1
0.47.2
0.47.3
0.47.4
0.47.5a1741824272
0.47.5a1741825046
0.47.5a1741825731
0.47.5a1741826544
0.47.5
0.48.0
0.49.0a1742393199
0.49.0a1742655039
0.49.0a1742657799
0.49.0a1742658030
0.49.0
0.50.0a1742865563
0.50.0a1742876514
0.50.0a1742886287
0.50.0a1742907455
0.50.0a1742975161
0.50.0
0.50.1
0.50.2
0.50.3
0.50.4a1743070636
0.50.4
0.50.5
0.51.0
0.51.1
0.51.2
0.52.0
0.52.1a1744119894
0.52.1
0.52.2
0.52.3a1744217583
0.52.3
0.52.4
0.53.0
0.53.1
0.54.0
0.55.0
0.55.1
0.55.2
0.55.3
0.55.4
0.55.5
0.55.6a1748524485
0.55.6a1748537170
0.55.6a1748538406
0.55.6a1748538717
0.55.6a1748545381
0.55.6a1748787282
0.55.6a1748962305
0.55.6a1749087129
0.55.6a1749087663
0.55.6a1749164000
0.55.6a1749165639
0.55.6a1749248294
0.55.6
0.56.0
0.56.1
0.58.0
0.59.0
0.59.1
0.59.2
0.59.3
0.59.4
0.59.5
0.59.6
0.59.7
0.59.8a1751106705
0.59.8a1751108327
0.59.8a1751108999
0.59.8a1751109262
0.59.8a1751111016
0.59.8a1751112652
0.59.8a1751112677
0.59.8
0.59.9
0.59.10
0.59.11
0.60.0a1753281532
0.60.0a1754435135
0.60.0a1756572336
0.60.0a1757458308
0.60.0
0.61.0
0.61.1a1758720414
0.61.1a1759438459
0.61.1a1759760384
0.61.1a1759760412
0.61.1
0.62.0a1759841118
0.62.0a1760004468
0.62.0
0.63.0
0.64.1a1760634145
0.64.1
0.65.0
0.65.1
0.66.0
0.66.1a1762937055
0.66.1a1762974632
0.66.1a1763030132
0.66.1
0.67.0a1763483513
0.67.0
0.67.1a1764068527
0.67.1
0.67.2a1764090224
0.67.2a1764093269
0.67.2
0.67.3
0.67.4
0.68.0
0.68.1a1765014482
0.68.1a1765105855
0.68.1a1765124818
0.68.1
0.68.2
0.68.3a1765794146
0.68.3a1765819014
0.68.3a1765819244
0.68.3
0.69.0
0.69.1a1766049382
0.69.1
0.69.2
0.69.3
0.70.0
0.71.0
0.71.1
0.71.2
0.71.3a1769867798
0.71.3a1769872847
0.71.3
0.71.4
0.71.5
0.71.6
0.72.0a1770588559
0.72.0a1770821888
0.72.0a1770914087

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/upsonic/PYSEC-2026-559.yaml"