starlette: Starlette is a lightweight ASGI framework/toolkit
CVE-2026-54283 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-54283, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-starlette · opensuse-leap 16.0 | 0.41.3-160000.4.1 | OPENSUSE-SU-2026:21053-1 | Jun 24, 2026 |
| python-starlette · sles 16.0 | 0.41.3-160000.4.1 | SUSE-SU-2026:22360-1 | Jun 24, 2026 |
| starlette · Debian 12.15 (bookworm) | 0.26.1-1+deb12u2 | DEBIAN-CVE-2026-54283 | Jun 22, 2026 |
| starlette · Debian 13.5 (trixie) | 0.46.1-3+deb13u3 | DEBIAN-CVE-2026-54283 | Jun 22, 2026 |
| starlette · Debian 14 | 1.3.1-1 | DEBIAN-CVE-2026-54283 | Jun 22, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.