{"id":"CVE-2026-54283","state":"PUBLISHED","title":"Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoS","description":"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.","publishedAt":"2026-06-22T16:46:16.706Z","updatedAt":"2026-06-23T16:10:51.227Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["Kludex starlette"],"affected":[{"vendor":"Kludex","product":"starlette","versions":[{"version":">= 0.4.1, < 1.3.1","status":"affected"}]}],"references":["https://github.com/Kludex/starlette/security/advisories/GHSA-82w8-qh3p-5jfq"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54283.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54283","state":"PUBLISHED","datePublished":"2026-06-22T16:46:16.706Z","dateUpdated":"2026-06-23T16:10:51.227Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-12T17:46:37.292Z"},"containers":{"cna":{"title":"Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoS","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Kludex","product":"starlette","versions":[{"version":">= 0.4.1, < 1.3.1","status":"affected"}]}],"references":[{"url":"https://github.com/Kludex/starlette/security/advisories/GHSA-82w8-qh3p-5jfq","name":"https://github.com/Kludex/starlette/security/advisories/GHSA-82w8-qh3p-5jfq","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-22T16:46:16.706Z"},"source":{"advisory":"GHSA-82w8-qh3p-5jfq","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-23T16:06:30.546768Z","id":"CVE-2026-54283","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-23T16:10:51.227Z"}}]}}}