{"answers":{"affected":"3 open source packages ship an affected version, including python-multipart. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-40347 in the wild and no public exploit code.","fix":"Upgrade python-multipart to 0.0.26 or later.","what":"CVE-2026-40347 is a medium-severity denial of service vulnerability in Kludex python-multipart, published on 17 Apr 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-2026-40347 and fix it if it is affected.\n\nWhat it is: CVE-2026-40347 is a medium-severity denial of service vulnerability in Kludex python-multipart, published on 17 Apr 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-2026-40347 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- python-multipart (PyPI): affected all versions; fixed in 0.0.26\n- python-multipart (PyPI): affected all versions; fixed in 0.0.26\n- python-multipart (PyPI): affected all versions; fixed in 0.0.26\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-2026-40347/ (Markdown: https://insights.sbomify.com/CVE-2026-40347/index.md)","id":"CVE-2026-40347","markdown":"https://insights.sbomify.com/CVE-2026-40347/index.md","name":"CVE-2026-40347","record":{"aliases":["CLEANSTART-2026-IO67375","CLEANSTART-2026-VJ88910","CLSA-2026-1781571262","DEBIAN-CVE-2026-40347","ECHO-93a8-8bc8-dfad","GHSA-mj87-hwqh-73pj","MINI-2mp6-x8g2-xvp4","MINI-98vm-gxc7-7vg7","MINI-9m84-ch59-pqh6","MINI-mhcg-w48q-qh79","MINI-p43r-67hv-fqx3","MINI-r27f-2fcg-x5mq","MINI-w23p-hqhx-5jpj","PYSEC-2026-3038","UBUNTU-CVE-2026-40347","openSUSE-SU-2026:10597-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python multipart parser","requires_auth":"none","summary":"Attackers can cause denial of service in applications using Python-Multipart by sending crafted requests with large preamble or epilogue data.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"python-multipart","vendor":"fastapiexpert"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-834","name":"Excessive Iteration"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted `multipart/form-data` requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.","ecosystems":["PyPI","openSUSE:Tumbleweed"],"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":"Python-Multipart affected by Denial of Service via large multipart preamble or epilogue data","id":"CVE-2026-40347","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"Movary has Authenticated SSRF via Jellyfin Server URL Verification that Allows Internal Network Probing","id":"CVE-2026-40348"},"packages":[{"ecosystem":"PyPI","fixed":["0.0.26"],"introduced":["0"],"last_affected":[],"package":"python-multipart","purl":null,"source":"GHSA-mj87-hwqh-73pj"},{"ecosystem":"PyPI","fixed":["0.0.26"],"introduced":["0"],"last_affected":[],"package":"python-multipart","purl":"pkg:pypi/python-multipart","source":"GHSA-mj87-hwqh-73pj"},{"ecosystem":"PyPI","fixed":["0.0.26"],"introduced":["0"],"last_affected":[],"package":"python-multipart","purl":"pkg:pypi/python-multipart","source":"PYSEC-2026-3038"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["0.0.26-1.1"],"introduced":["0"],"last_affected":[],"package":"python-python-multipart","purl":"pkg:rpm/opensuse/python-python-multipart\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10597-1"}],"prev":{"headline":"NocoBase has SSRF in Workflow HTTP Request and Custom Request Plugins","id":"CVE-2026-40346"},"products":["python-multipart"],"published":"2026-04-17","related":[{"cvss_score":8.6,"headline":"Python-Multipart has Arbitrary File Write via Non-Default Configuration","id":"CVE-2026-24486","kev_date_added":null,"published":"2026-01-27"},{"cvss_score":7.5,"headline":"Python-Multipart: Quadratic-time querystring parsing with semicolon separators causes CPU denial of service","id":"CVE-2026-53539","kev_date_added":null,"published":"2026-06-22"},{"cvss_score":7.5,"headline":"python-multipart vulnerable to content-type header Regular expression Denial of Service","id":"CVE-2024-24762","kev_date_added":null,"published":"2024-02-05"},{"cvss_score":3.7,"headline":"Python-Multipart: Content-Disposition parameter smuggling via RFC 2231/5987 extended parameters","id":"CVE-2026-53537","kev_date_added":null,"published":"2026-06-22"},{"cvss_score":3.7,"headline":"Python-Multipart: Semicolon treated as querystring field separator enables parameter smuggling","id":"CVE-2026-53538","kev_date_added":null,"published":"2026-06-22"},{"cvss_score":3.7,"headline":"Python-Multipart: Negative Content-Length in parse_form buffers the entire body in memory","id":"CVE-2026-53540","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":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"2026-04-20","vendors":["Kludex"]},"summary":"Attackers can cause denial of service in applications using Python-Multipart by sending crafted requests with large preamble or epilogue data.","url":"https://insights.sbomify.com/CVE-2026-40347/"}