CVE-2026-54283: Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoS
Kludex · starlette
Affected: Kludex starlette · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 42% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Kludex · starlette>= 0.4.1, < 1.3.1
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-54283 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.