CVE catalog
CVE-2026-54283
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 e
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.48% · Oct 27, 2026
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.
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 | 1.3.1 | fixed |
| PyPI | starlette | Not reported | 1.3.1 | fixed |
| Cpe | starlette | Not reported | 1.3.1 | 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 | [1140631] |
| Debian | starlette | source | forky | 1.3.1-1 | not yet assigned | Not reported | [1140631] |
| Debian | starlette | source | trixie | 0.46.1-3+deb13u3 | not yet assigned | Not reported | [1140631] |
| Debian | starlette | source | bookworm | 0.26.1-1+deb12u2 | not yet assigned | Not reported | [1140631] |
| Cpe | starlette | cpe | Not reported | 1.3.1 | Not reported | Not reported | Not reported |
| PyPI | starlette | PyPI | Not reported | 1.3.1 | Not reported | GHSA-82W8-QH3P-5JFQ | Not reported |
| Cpe | starlette | cpe | Not reported | 1.3.1 | Not reported | NVD-CVE-2026-54283 | 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
Observed:
References
- [https://access.redhat.com/errata/RHSA-2026:50479]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_21053-1.json]
- [https://github.com/Kludex/starlette/security/advisories/GHSA-82w8-qh3p-5jfq]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-54283]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-54283]
- [https://osv.dev/vulnerability/GHSA-82w8-qh3p-5jfq]
- [https://security-tracker.debian.org/tracker/CVE-2026-54283]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]