{"answers":{"affected":"3 open source packages ship an affected version, including starlette. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-54283 in the wild and no public exploit code.","fix":"Upgrade starlette to 1.3.1 or later.","what":"CVE-2026-54283 is a high-severity denial of service vulnerability in Kludex starlette, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54283 and fix it if it is affected.\n\nWhat it is: CVE-2026-54283 is a high-severity denial of service vulnerability in Kludex starlette, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-54283 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- starlette (PyPI): affected from 0.4.1; fixed in 1.3.1\n- starlette (PyPI): affected from 0.4.1; fixed in 1.3.1\n- starlette (PyPI): affected from 0.4.1; fixed in 1.3.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-54283/ (Markdown: https://insights.sbomify.com/CVE-2026-54283/index.md)","id":"CVE-2026-54283","markdown":"https://insights.sbomify.com/CVE-2026-54283/index.md","name":"CVE-2026-54283","record":{"aliases":["CLEANSTART-2026-PN29190","CLEANSTART-2026-SB78573","CLSA-2026-1782954022","DEBIAN-CVE-2026-54283","ECHO-9688-fa29-3d55","GHSA-82w8-qh3p-5jfq","MINI-2p56-j3fp-86c4","MINI-32pf-w8w6-9x57","MINI-3xr5-9rrm-566w","MINI-5xpq-wfpj-72c7","MINI-7ch9-vmfq-4j5x","MINI-7r7c-32j8-485j","MINI-8xvf-vw83-hr5g","MINI-f255-7cc6-c8hq","MINI-g67m-mv2m-gcm5","MINI-jhg8-q7gc-rm8m","MINI-jr3q-5w3h-ccjw","MINI-qg42-3vp5-gqq6","MINI-qpj8-p6wf-c854","MINI-rpj4-7jq4-5gqc","MINI-rxqm-c5cv-qjrr","MINI-vg52-944r-4mph","MINI-x56h-7r3r-xwjf","PYSEC-2026-249","ROOT-APP-PYPI-CVE-2026-54283","UBUNTU-CVE-2026-54283"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python ASGI framework","requires_auth":"none","summary":"An unauthenticated attacker can cause denial of service by sending large urlencoded form data, bypassing configured resource limits in Starlette.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"starlette","vendor":"encode"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoS","id":"CVE-2026-54283","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"sqlparse: TokenList.__init__ materializes O(subtree) value per group, causing CPU DoS before depth/token caps trigger","id":"CVE-2026-54284"},"packages":[{"ecosystem":"PyPI","fixed":["1.3.1"],"introduced":["0.4.1"],"last_affected":[],"package":"starlette","purl":null,"source":"GHSA-82w8-qh3p-5jfq"},{"ecosystem":"PyPI","fixed":["1.3.1"],"introduced":["0.4.1"],"last_affected":[],"package":"starlette","purl":"pkg:pypi/starlette","source":"GHSA-82w8-qh3p-5jfq"},{"ecosystem":"PyPI","fixed":["1.3.1"],"introduced":["0.4.1"],"last_affected":[],"package":"starlette","purl":"pkg:pypi/starlette","source":"PYSEC-2026-249"}],"prev":{"headline":"Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname","id":"CVE-2026-54282"},"products":["starlette"],"published":"2026-06-22","related":[{"cvss_score":6.5,"headline":"Kludex Starlette HTTP Request/Response Smuggling","id":"CVE-2026-48710","kev_date_added":"2026-09-02","published":"2026-05-26"},{"cvss_score":7.5,"headline":"Starlette: SSRF and NTLM credential theft via UNC paths in StaticFiles on Windows","id":"CVE-2026-48818","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":7.5,"headline":"Starlette has Path Traversal vulnerability in StaticFiles","id":"CVE-2023-29159","kev_date_added":null,"published":"2023-06-01"},{"cvss_score":7.5,"headline":"MultipartParser DOS with too many fields or files in Starlette Framework","id":"CVE-2023-30798","kev_date_added":null,"published":"2023-04-21"},{"cvss_score":5.3,"headline":"Starlette: Arbitrary HTTP method dispatched to `HTTPEndpoint` attributes via `getattr`","id":"CVE-2026-48817","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":3.7,"headline":"Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname","id":"CVE-2026-54282","kev_date_added":null,"published":"2026-06-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-23","vendors":["Kludex"]},"summary":"An unauthenticated attacker can cause denial of service by sending large urlencoded form data, bypassing configured resource limits in Starlette.","url":"https://insights.sbomify.com/CVE-2026-54283/"}