PYSEC-2026-2281

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/starlette/PYSEC-2026-2281.yaml
JSON Data
https://api.test.osv.dev/v1/vulns/PYSEC-2026-2281
Aliases
Published
2026-06-17T19:18:09Z
Modified
2026-07-13T07:30:40Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and earlier, StaticFiles on Windows is vulnerable to SSRF. An UNC path such as \attacker.com\share can cause os.path.realpath to initiate an outbound SMB connection before the path is rejected, exposing the service account’s NTLMv2 credentials for offline cracking or relay even though the HTTP response is only a 404. The issue affects default follow_symlink=False deployments, including frameworks built on Starlette such as FastAPI; POSIX systems and follow_symlink=True are unaffected. The issue is fixed in 1.1.0.

References

Affected packages

PyPI / starlette

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.1.0

Affected versions

0.*
0.1.0
0.1.1
0.1.2
0.1.3
0.1.4
0.1.5
0.1.6
0.1.7
0.1.8
0.1.9
0.1.10
0.1.11
0.1.12
0.1.13
0.1.14
0.1.15
0.1.16
0.1.17
0.2.0
0.2.1
0.2.2
0.2.3
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5
0.3.6
0.3.7
0.4.0
0.4.1
0.4.2
0.5.0
0.5.1
0.5.2
0.5.3
0.5.4
0.5.5
0.6.0
0.6.1
0.6.2
0.6.3
0.7.0
0.7.1
0.7.2
0.7.3
0.7.4
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.8.8
0.9.0
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.7
0.9.8
0.9.9
0.9.10
0.9.11
0.10.0
0.10.1
0.10.2
0.10.3
0.10.4
0.10.5
0.10.6
0.10.7
0.11.0
0.11.1
0.11.2
0.11.3
0.11.4
0.12.0b1
0.12.0b2
0.12.0b3
0.12.0
0.12.1
0.12.2
0.12.3
0.12.4
0.12.5
0.12.6
0.12.7
0.12.8
0.12.9
0.12.10
0.12.11
0.12.12
0.12.13
0.13.0
0.13.1
0.13.2
0.13.3
0.13.4
0.13.5
0.13.6
0.13.7
0.13.8
0.14.0
0.14.1
0.14.2
0.15.0
0.16.0
0.17.0
0.17.1
0.18.0
0.19.0
0.19.1
0.20.0
0.20.1
0.20.2
0.20.3
0.20.4
0.21.0
0.22.0
0.23.0
0.23.1
0.24.0
0.25.0
0.26.0
0.26.0.post1
0.26.1
0.27.0
0.28.0
0.29.0
0.30.0
0.31.0
0.31.1
0.32.0
0.32.0.post1
0.33.0
0.34.0
0.35.0
0.35.1
0.36.0
0.36.1
0.36.2
0.36.3
0.37.0
0.37.1
0.37.2
0.38.0
0.38.1
0.38.2
0.38.3
0.38.4
0.38.5
0.38.6
0.39.0
0.39.1
0.39.2
0.40.0
0.41.0
0.41.1
0.41.2
0.41.3
0.42.0
0.43.0
0.44.0
0.45.0
0.45.1
0.45.2
0.45.3
0.46.0
0.46.1
0.46.2
0.47.0
0.47.1
0.47.2
0.47.3
0.48.0
0.49.0
0.49.1
0.49.2
0.49.3
0.50.0
0.51.0
0.52.0
0.52.1
1.*
1.0.0rc1
1.0.0
1.0.1

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/starlette/PYSEC-2026-2281.yaml"