Bug 2491440 (CVE-2026-54283) - CVE-2026-54283 starlette: Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoS
Summary: CVE-2026-54283 starlette: Starlette: request.form() limits silently ignored f...
Keywords:
Status: NEW
Alias: CVE-2026-54283
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-22 18:01 UTC by OSIDB Bzimport
Modified: 2026-07-02 16:57 UTC (History)
64 users (show)

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Description OSIDB Bzimport 2026-06-22 18:01:28 UTC 
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.
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