# CVE-2026-54282: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-54282
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 22, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-starlette opensuse-leap 16.0 | 0.41.3-160000.4.1 | [OPENSUSE-SU-2026:21053-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21053-1.md) | Jun 24, 2026 |
| Linux | python-starlette sles 16.0 | 0.41.3-160000.4.1 | [SUSE-SU-2026:22360-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22360-1.md) | Jun 24, 2026 |
| Linux | starlette Debian 12.15 (bookworm) | 0.26.1-1+deb12u2 | [DEBIAN-CVE-2026-54282](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54282.md) | Jun 22, 2026 |
| Linux | starlette Debian 13.5 (trixie) | 0.46.1-3+deb13u3 | [DEBIAN-CVE-2026-54282](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54282.md) | Jun 22, 2026 |
| Linux | starlette Debian 14 | 1.3.1-1 | [DEBIAN-CVE-2026-54282](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54282.md) | Jun 22, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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