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Low severity3.7GHSA Advisory· Published Jun 22, 2026· Updated Jun 26, 2026

CVE-2026-54282

CVE-2026-54282

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
StarlettePyPI
< 1.3.01.3.0

Affected products

27

Patches

Vulnerability mechanics

References

4

News mentions

0

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