Vulnerability Details CVE-2026-54283
Starlette is a lightweight ASGI framework/toolkit. From 0.4.1 until 1.3.1, request.form() accepts max_fields and max_part_size to bound resource consumption while parsing form data. These limits are enforced for multipart/form-data, but silently ignored for application/x-www-form-urlencoded. An unauthenticated attacker can therefore send a urlencoded body with an arbitrarily large number of fields or an arbitrarily large field, even when the application configured limits it believed would apply. This vulnerability is fixed in 1.3.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 19.2%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-54283
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cpe:2.3:a:encode:starlette:0.10.0
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cpe:2.3:a:encode:starlette:0.10.1
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cpe:2.3:a:encode:starlette:0.10.2
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cpe:2.3:a:encode:starlette:0.10.3
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cpe:2.3:a:encode:starlette:0.10.4
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cpe:2.3:a:encode:starlette:0.10.6
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cpe:2.3:a:encode:starlette:0.10.7
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cpe:2.3:a:encode:starlette:0.11.1
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cpe:2.3:a:encode:starlette:0.11.2
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cpe:2.3:a:encode:starlette:0.11.3
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cpe:2.3:a:encode:starlette:0.11.4
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cpe:2.3:a:encode:starlette:0.12.0
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cpe:2.3:a:encode:starlette:0.12.11
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cpe:2.3:a:encode:starlette:0.12.12
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cpe:2.3:a:encode:starlette:0.12.13
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cpe:2.3:a:encode:starlette:0.12.2
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cpe:2.3:a:encode:starlette:0.12.3
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cpe:2.3:a:encode:starlette:0.12.4
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cpe:2.3:a:encode:starlette:0.12.5
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cpe:2.3:a:encode:starlette:0.12.6
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cpe:2.3:a:encode:starlette:0.12.7
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cpe:2.3:a:encode:starlette:0.12.8
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cpe:2.3:a:encode:starlette:0.12.9
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cpe:2.3:a:encode:starlette:0.13.0
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cpe:2.3:a:encode:starlette:0.13.1
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cpe:2.3:a:encode:starlette:0.13.2
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cpe:2.3:a:encode:starlette:0.13.3
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cpe:2.3:a:encode:starlette:0.13.4
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cpe:2.3:a:encode:starlette:0.13.5
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cpe:2.3:a:encode:starlette:0.13.6
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cpe:2.3:a:encode:starlette:0.13.7
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cpe:2.3:a:encode:starlette:0.13.8
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cpe:2.3:a:encode:starlette:0.14.0
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cpe:2.3:a:encode:starlette:0.14.1
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cpe:2.3:a:encode:starlette:0.14.2
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cpe:2.3:a:encode:starlette:0.15.0
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cpe:2.3:a:encode:starlette:0.16.0
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cpe:2.3:a:encode:starlette:0.17.0
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cpe:2.3:a:encode:starlette:0.17.1
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cpe:2.3:a:encode:starlette:0.18.0
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cpe:2.3:a:encode:starlette:0.19.0
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cpe:2.3:a:encode:starlette:0.19.1
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cpe:2.3:a:encode:starlette:0.20.0
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cpe:2.3:a:encode:starlette:0.20.1
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cpe:2.3:a:encode:starlette:0.20.2
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cpe:2.3:a:encode:starlette:0.20.3
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cpe:2.3:a:encode:starlette:0.20.4
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cpe:2.3:a:encode:starlette:0.21.0
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cpe:2.3:a:encode:starlette:0.22.0
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cpe:2.3:a:encode:starlette:0.23.0
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cpe:2.3:a:encode:starlette:0.23.1
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cpe:2.3:a:encode:starlette:0.24.0
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cpe:2.3:a:encode:starlette:0.25.0
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cpe:2.3:a:encode:starlette:0.26.0
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cpe:2.3:a:encode:starlette:0.26.1
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cpe:2.3:a:encode:starlette:0.27.0
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cpe:2.3:a:encode:starlette:0.28.0
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cpe:2.3:a:encode:starlette:0.29.0
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cpe:2.3:a:encode:starlette:0.30.0
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cpe:2.3:a:encode:starlette:0.31.0
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cpe:2.3:a:encode:starlette:0.31.1
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cpe:2.3:a:encode:starlette:0.32.0
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cpe:2.3:a:encode:starlette:0.33.0
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cpe:2.3:a:encode:starlette:0.34.0
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cpe:2.3:a:encode:starlette:0.35.0
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cpe:2.3:a:encode:starlette:0.35.1
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cpe:2.3:a:encode:starlette:0.36.0
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cpe:2.3:a:encode:starlette:0.36.1
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cpe:2.3:a:encode:starlette:0.36.2
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cpe:2.3:a:encode:starlette:0.36.3
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cpe:2.3:a:encode:starlette:0.37.0
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cpe:2.3:a:encode:starlette:0.37.1
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cpe:2.3:a:encode:starlette:0.37.2
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cpe:2.3:a:encode:starlette:0.38.0
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cpe:2.3:a:encode:starlette:0.38.1
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cpe:2.3:a:encode:starlette:0.38.2
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cpe:2.3:a:encode:starlette:0.38.3
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cpe:2.3:a:encode:starlette:0.38.4
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cpe:2.3:a:encode:starlette:0.38.5
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cpe:2.3:a:encode:starlette:0.38.6
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cpe:2.3:a:encode:starlette:0.39.0
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cpe:2.3:a:encode:starlette:0.39.1
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cpe:2.3:a:encode:starlette:0.39.2
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cpe:2.3:a:encode:starlette:0.4.1
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cpe:2.3:a:encode:starlette:0.4.2
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cpe:2.3:a:encode:starlette:0.40.0
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cpe:2.3:a:encode:starlette:0.41.0
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cpe:2.3:a:encode:starlette:0.41.1
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cpe:2.3:a:encode:starlette:0.41.2
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cpe:2.3:a:encode:starlette:0.41.3
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cpe:2.3:a:encode:starlette:0.42.0
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cpe:2.3:a:encode:starlette:0.43.0
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cpe:2.3:a:encode:starlette:0.44.0
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cpe:2.3:a:encode:starlette:0.45.0
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cpe:2.3:a:encode:starlette:0.45.1
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cpe:2.3:a:encode:starlette:0.45.2
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cpe:2.3:a:encode:starlette:0.45.3
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cpe:2.3:a:encode:starlette:0.46.0
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cpe:2.3:a:encode:starlette:0.46.1
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cpe:2.3:a:encode:starlette:0.46.2
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cpe:2.3:a:encode:starlette:0.47.0
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cpe:2.3:a:encode:starlette:0.47.1
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cpe:2.3:a:encode:starlette:0.47.2
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cpe:2.3:a:encode:starlette:0.47.3
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cpe:2.3:a:encode:starlette:0.48.0
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cpe:2.3:a:encode:starlette:0.49.0
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cpe:2.3:a:encode:starlette:0.49.1
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cpe:2.3:a:encode:starlette:0.49.2
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cpe:2.3:a:encode:starlette:0.49.3
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cpe:2.3:a:encode:starlette:0.5.0
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cpe:2.3:a:encode:starlette:0.5.1
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cpe:2.3:a:encode:starlette:0.5.2
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cpe:2.3:a:encode:starlette:0.5.3
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cpe:2.3:a:encode:starlette:0.5.4
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cpe:2.3:a:encode:starlette:0.5.5
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cpe:2.3:a:encode:starlette:0.50.0
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cpe:2.3:a:encode:starlette:0.51.0
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cpe:2.3:a:encode:starlette:0.52.0
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cpe:2.3:a:encode:starlette:0.52.1
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cpe:2.3:a:encode:starlette:0.6.0
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cpe:2.3:a:encode:starlette:0.6.1
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cpe:2.3:a:encode:starlette:0.6.2
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cpe:2.3:a:encode:starlette:0.6.3
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cpe:2.3:a:encode:starlette:0.7.0
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cpe:2.3:a:encode:starlette:0.7.1
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cpe:2.3:a:encode:starlette:0.7.2
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cpe:2.3:a:encode:starlette:0.7.3
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cpe:2.3:a:encode:starlette:0.7.4
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cpe:2.3:a:encode:starlette:0.8.0
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cpe:2.3:a:encode:starlette:0.8.1
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cpe:2.3:a:encode:starlette:0.8.2
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cpe:2.3:a:encode:starlette:0.8.3
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cpe:2.3:a:encode:starlette:0.8.4
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cpe:2.3:a:encode:starlette:0.8.5
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cpe:2.3:a:encode:starlette:0.8.6
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cpe:2.3:a:encode:starlette:0.8.7
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cpe:2.3:a:encode:starlette:0.8.8
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cpe:2.3:a:encode:starlette:0.9.0
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cpe:2.3:a:encode:starlette:0.9.1
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cpe:2.3:a:encode:starlette:0.9.10
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cpe:2.3:a:encode:starlette:0.9.11
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cpe:2.3:a:encode:starlette:0.9.2
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cpe:2.3:a:encode:starlette:0.9.3
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cpe:2.3:a:encode:starlette:0.9.4
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cpe:2.3:a:encode:starlette:0.9.5
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cpe:2.3:a:encode:starlette:0.9.6
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cpe:2.3:a:encode:starlette:0.9.7
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cpe:2.3:a:encode:starlette:0.9.8
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cpe:2.3:a:encode:starlette:0.9.9
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cpe:2.3:a:encode:starlette:1.0.0
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cpe:2.3:a:encode:starlette:1.0.1
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cpe:2.3:a:encode:starlette:1.1.0
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cpe:2.3:a:encode:starlette:1.2.0
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cpe:2.3:a:encode:starlette:1.2.1