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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 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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e4a0d131d9b351765777202c5b27ef2f9672f6b67a4e063aec7cd23f96189f42
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"starlette","vendor":"Kludex","versions":[{"status":"affected","version":">= 0.4.1, < 1.3.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8de471061e83554f3d3e666aba56a1fca825d87c3a64094e77e7a99fd34480a0 · sha256:e2ef0ef4a8f19625… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8de471061e83554f3d3e666aba56a1fca825d87c3a64094e77e7a99fd34480a0 · sha256:e2ef0ef4a8f19625… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8de471061e83554f3d3e666aba56a1fca825d87c3a64094e77e7a99fd34480a0 · sha256:e2ef0ef4a8f19625… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/Kludex/starlette/security/advisories/GHSA-82w8-qh3p-5jfq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Kludex/starlette/security/advisories/GHSA-82w8-qh3p-5jfq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8de471061e83554f3d3e666aba56a1fca825d87c3a64094e77e7a99fd34480a0 · sha256:e2ef0ef4a8f19625… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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