CVE catalog
CVE-2026-54282
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
- Severity
- Medium · CVSS 4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.27% · Oct 27, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | starlette | sid | 1.9.0-1 | fixed |
| Debian | starlette | forky | 1.9.0-1 | fixed |
| Debian | starlette | trixie | 0.46.1-3+deb13u3 | fixed |
| Debian | starlette | trixie-security | 0.46.1-3+deb13u3 | fixed |
| Debian | starlette | bookworm | 0.26.1-1+deb12u1 | vulnerable |
| Debian | starlette | bookworm-security | 0.26.1-1+deb12u2 | fixed |
| Cpe | starlette | Not reported | 1.3.0 | fixed |
| PyPI | starlette | Not reported | 1.3.0 | fixed |
| Opensuse | python-starlette | tumbleweed | 1.3.1-1.1 | fixed |
| Cpe | starlette | Not reported | 1.3.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | starlette | source | sid | 1.3.1-1 | not yet assigned | Not reported | [1140632] |
| Debian | starlette | source | forky | 1.3.1-1 | not yet assigned | Not reported | [1140632] |
| Debian | starlette | source | trixie | 0.46.1-3+deb13u3 | not yet assigned | Not reported | [1140632] |
| Debian | starlette | source | bookworm | 0.26.1-1+deb12u2 | not yet assigned | Not reported | [1140632] |
| Cpe | starlette | cpe | Not reported | 1.3.0 | Not reported | Not reported | Not reported |
| PyPI | starlette | PyPI | Not reported | 1.3.0 | Not reported | GHSA-JP82-JPQV-5VV3 | Not reported |
| Opensuse | python-starlette | rpm | tumbleweed | 1.3.1-1.1 | Not reported | OPENSUSE-SU-2026:11058-1 | Not reported |
| Cpe | starlette | cpe | Not reported | 1.3.0 | Not reported | NVD-CVE-2026-54282 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-starlette]Affected
Source package: [starlette]
Details (4)
0.26.1-1+deb12u1· all · bookwormAffected · Fixed:
0.26.1-1+deb12u2nvd · starlette · debian · bookworm; nvd · starlette · debian · 12
0.26.1-1+deb12u1· all · bookwormAffected · Fixed:
0.26.1-1+deb12u2nvd · starlette · debian · bookworm; nvd · starlette · debian · 12
0.26.1-1+deb12u2· all · bookworm-securityFixed · Fixed:
0.26.1-1+deb12u2nvd · starlette · debian · bookworm; nvd · starlette · debian · 12
0.26.1-1+deb12u2· all · bookworm-securityFixed · Fixed:
0.26.1-1+deb12u2nvd · starlette · debian · bookworm; nvd · starlette · debian · 12
[Debian 13 (Trixie)]
- [python3-starlette]Affected
Source package: [starlette]
Details (5)
0.46.1-3+deb13u2· all · trixieAffected · Fixed:
0.46.1-3+deb13u3nvd · starlette · debian · 13
0.46.1-3+deb13u2· all · trixieAffected · Fixed:
0.46.1-3+deb13u3nvd · starlette · debian · 13
0.46.1-3+deb13u2· all · trixie-security · Historical versionAffected · Fixed:
0.46.1-3+deb13u3nvd · starlette · debian · 13
0.46.1-3+deb13u3· all · trixie-securityFixed · Fixed:
0.46.1-3+deb13u3nvd · starlette · debian · 13
0.46.1-3+deb13u3· all · trixie-securityFixed · Fixed:
0.46.1-3+deb13u3nvd · starlette · debian · 13
[openSUSE Tumbleweed]
- [python313-starlette]Unknown
Source package: [python-starlette]
Details (1)
1.6.0-1.1· noarch · tumbleweedUnknown · Fixed:
1.3.1-1.1Version impact unknown
nvd · python-starlette · opensuse · tumbleweed
- [python314-starlette]Unknown
Source package: [python-starlette]
Details (1)
1.6.0-1.1· noarch · tumbleweedUnknown · Fixed:
1.3.1-1.1Version impact unknown
nvd · python-starlette · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11058-1.json]
- [https://github.com/Kludex/starlette/security/advisories/GHSA-jp82-jpqv-5vv3]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-54282]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-54282]
- [https://osv.dev/vulnerability/GHSA-jp82-jpqv-5vv3]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11058-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-54282]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54282.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]