{"answers":{"affected":"3 open source packages ship an affected version, including tornado.","exploited":"There is no known exploitation of CVE-2026-82397 in the wild and no public exploit code.","fix":"Upgrade tornado to 6.5.8 or later.","what":"CVE-2026-82397 is a high-severity denial of service vulnerability in tornadoweb tornado, published on 31 Aug 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-2026-82397 and fix it if it is affected.\n\nWhat it is: CVE-2026-82397 is a high-severity denial of service vulnerability in tornadoweb tornado, published on 31 Aug 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-2026-82397 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- tornado (PyPI): affected all versions; fixed in 6.5.8\n- tornado (PyPI): affected all versions; fixed in 6.5.8\n- tornado (PyPI): affected all versions; fixed in 6.5.8\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-2026-82397/ (Markdown: https://insights.sbomify.com/CVE-2026-82397/index.md)","id":"CVE-2026-82397","markdown":"https://insights.sbomify.com/CVE-2026-82397/index.md","name":"CVE-2026-82397","record":{"aliases":["AZL-98544","BELL-CVE-2026-82397","CLEANSTART-2026-CX71098","CLEANSTART-2026-QT13587","CLEANSTART-2026-TA08611","CLEANSTART-2026-TZ94047","DEBIAN-CVE-2026-82397","ECHO-093b-7cf6-cf48","GHSA-mpf4-983q-p7j4","MINI-2g5r-vjx6-m3f4","MINI-2jc8-q35m-r3qx","MINI-2qxp-h68q-48fm","MINI-3g5j-49hx-3g9p","MINI-4hj2-cqq8-c54x","MINI-4rcf-hj2x-cfvp","MINI-59j8-c948-4683","MINI-7f2x-7j42-q74r","MINI-7p87-6cfw-cpj5","MINI-87j3-pj3r-7jcp","MINI-9927-8747-3x6f","MINI-9f2m-vjjj-fxg5","MINI-cc5q-8wf8-5qq7","MINI-cr7w-gjgj-vrjf","MINI-f5mh-86g8-8w6x","MINI-fxgp-v9gv-wgr8","MINI-g2fc-fj5v-qcw3","MINI-p2fq-mgm7-wc93","MINI-p78m-47vq-9hv2","MINI-p92m-g839-xrcg","MINI-qr69-rq4h-pp78","MINI-v3f9-w6qp-hxjq","MINI-xj59-7g92-9338","OESA-2026-3971","OESA-2026-3972","OESA-2026-3973","PYSEC-2026-3928","ROOT-APP-PYPI-CVE-2026-82397","SUSE-SU-2026:23523-1","SUSE-SU-2026:4073-1","SUSE-SU-2026:4076-1","UBUNTU-CVE-2026-82397"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python web framework","requires_auth":"none","summary":"An unauthenticated attacker can stall the Tornado event loop by sending a request with millions of form fields, causing denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"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-400","name":"Uncontrolled Resource Consumption"},{"id":"CWE-1284","name":"Improper Validation of Specified Quantity in Input"}],"description":"Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py, so an unauthenticated request body containing millions of separator-delimited fields can synchronously stall the single-threaded event loop and delay every connection. The body is bounded only by max_buffer_size, which defaults to 104857600 bytes. This issue is fixed in version 6.5.8.","ecosystems":["PyPI","SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","SUSE:Linux Enterprise Micro 5.3","SUSE:Linux Enterprise Micro 5.4","SUSE:Linux Enterprise Micro 5.5","SUSE:Linux Enterprise Module for Basesystem 15 SP7","SUSE:Linux Enterprise Module for Python 3 15 SP7","SUSE:Linux Enterprise Server 15 SP4-LTSS","SUSE:Linux Enterprise Server 15 SP5-LTSS","SUSE:Linux Enterprise Server 15 SP6-LTSS","SUSE:Linux Enterprise Server for SAP Applications 15 SP4","SUSE:Linux Enterprise Server for SAP Applications 15 SP5","SUSE:Linux Enterprise Server for SAP Applications 15 SP6","SUSE:Linux Micro 6.1"],"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":"Tornado: Urlencoded body parsing omits max_num_fields, so one request can stall the event loop","id":"CVE-2026-82397","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":29,"n_references":4,"next":{"headline":"pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace","id":"CVE-2026-82398"},"packages":[{"ecosystem":"PyPI","fixed":["6.5.8"],"introduced":["0"],"last_affected":[],"package":"tornado","purl":null,"source":"GHSA-mpf4-983q-p7j4"},{"ecosystem":"PyPI","fixed":["6.5.8"],"introduced":["0"],"last_affected":[],"package":"tornado","purl":"pkg:pypi/tornado","source":"GHSA-mpf4-983q-p7j4"},{"ecosystem":"PyPI","fixed":["6.5.8"],"introduced":["0"],"last_affected":[],"package":"tornado","purl":"pkg:pypi/tornado","source":"PYSEC-2026-3928"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOS","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOS","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSS","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSS","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise Micro 5.3","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Micro%205.3","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Micro 5.4","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Micro%205.4","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Micro 5.5","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Micro%205.5","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP7","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP7","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP7","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP4","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP4","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","fixed":["4.5.3-150000.3.28.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6","source":"SUSE-SU-2026:4073-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","fixed":["6.3.2-150400.9.24.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6","source":"SUSE-SU-2026:4076-1"},{"ecosystem":"SUSE:Linux Micro 6.1","fixed":["6.4-slfo.1.1_7.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Micro%206.1","source":"SUSE-SU-2026:23523-1"}],"prev":{"headline":"Sulu: Stored XSS via media download inline-disposition override","id":"CVE-2026-82396"},"products":["tornado"],"published":"2026-08-31","related":[],"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":"SUSE"},{"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":"2026-09-02","vendors":["tornadoweb"]},"summary":"An unauthenticated attacker can stall the Tornado event loop by sending a request with millions of form fields, causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-82397/"}