starlette: Starlette is a lightweight ASGI framework/toolkit
CVE-2026-54282 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-54282, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Starlette is a lightweight ASGI framework/toolkit. Prior to 1.3.0, the HTTP request path is not validated before being used to reconstruct request.url. Because request.url is rebuilt by concatenating {scheme}://{host}{path} and re-parsing the result, a path that does not begin with / (for example @google.com) moves the authority boundary during re-parsing, so request.url.hostname and request.url.netloc become attacker-controlled. Code that reads request.url.hostname (rather than the Host header or scope) can therefore be misled into trusting an attacker-supplied host. This vulnerability is fixed in 1.3.0.
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-2026-54282 | Jun 22, 2026 |
| starlette · Debian 13.5 (trixie) | 0.46.1-3+deb13u3 | DEBIAN-CVE-2026-54282 | Jun 22, 2026 |
| starlette · Debian 14 | 1.3.1-1 | DEBIAN-CVE-2026-54282 | Jun 22, 2026 |
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