{"answers":{"affected":"3 open source packages ship an affected version, including tornado. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-31958 in the wild and no public exploit code.","fix":"Upgrade tornado to 6.5.5 or later.","what":"CVE-2026-31958 is a high-severity denial of service vulnerability in tornadoweb tornado, published on 11 Mar 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-2026-31958 and fix it if it is affected.\n\nWhat it is: CVE-2026-31958 is a high-severity denial of service vulnerability in tornadoweb tornado, published on 11 Mar 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-2026-31958 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- tornado (PyPI): affected all versions; fixed in 6.5.5\n- tornado (PyPI): affected all versions; fixed in 6.5.5\n- tornado (PyPI): affected all versions; fixed in 6.5.5\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-2026-31958/ (Markdown: https://insights.sbomify.com/CVE-2026-31958/index.md)","id":"CVE-2026-31958","markdown":"https://insights.sbomify.com/CVE-2026-31958/index.md","name":"CVE-2026-31958","record":{"aliases":["ALSA-2026:8093","BELL-CVE-2026-31958","CLEANSTART-2026-KC70248","CLEANSTART-2026-TN75201","DEBIAN-CVE-2026-31958","ECHO-5939-f806-1836","GHSA-qjxf-f2mg-c6mc","MINI-8jw5-h5rw-7f56","MINI-ffcm-3cr9-rp48","MINI-pc2r-4mwh-pjvc","MINI-qf5p-g9wx-qc42","OESA-2026-1673","OESA-2026-1674","OESA-2026-1675","OESA-2026-1676","OESA-2026-1677","OESA-2026-1995","PYSEC-2026-140","RHSA-2026:8093","RLSA-2026:8093","ROOT-APP-PYPI-CVE-2026-31958","SUSE-SU-2026:1064-1","SUSE-SU-2026:1171-1","SUSE-SU-2026:1519-1","SUSE-SU-2026:1520-1","SUSE-SU-2026:1521-1","SUSE-SU-2026:1523-1","SUSE-SU-2026:1525-1","SUSE-SU-2026:20761-1","SUSE-SU-2026:20770-1","SUSE-SU-2026:20797-1","SUSE-SU-2026:20919-1","SUSE-SU-2026:21993-1","SUSE-SU-2026:2252-1","SUSE-SU-2026:2256-1","SUSE-SU-2026:2257-1","UBUNTU-CVE-2026-31958","openSUSE-SU-2026:10374-1","openSUSE-SU-2026:20406-1","openSUSE-SU-2026:20918-1"],"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":"Attackers can cause denial of service in Tornado web framework by sending multipart requests with excessive parts, blocking the main thread.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"tornado","vendor":"tornadoweb"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5.","ecosystems":["AlmaLinux:8","PyPI","Red Hat:enterprise_linux:8::highavailability","Red Hat:enterprise_linux:8::resilientstorage","Rocky Linux:8","SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","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 5.2","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 16.0","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 Enterprise Server for SAP applications 16.0","SUSE:Linux Micro 6.0","SUSE:Linux Micro 6.1","SUSE:Linux Micro 6.2","SUSE:Multi Linux Manager Tools EL-8","SUSE:Multi Linux Manager Tools EL-9","SUSE:Multi Linux Manager Tools RES-7","SUSE:Multi Linux Manager Tools SLE-12","SUSE:Multi Linux Manager Tools SLE-15","SUSE:Multi Linux Manager Tools SLE-Micro-5","SUSE:RES-7:Update:Products:MultiLinuxManagerTools:Update","SUSE:RES-8:Update:Products:MultiLinuxManagerTools:Update","openSUSE:Leap 15.6","openSUSE:Leap 16.0","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":"Tornado has a DoS due to too many multipart parts","id":"CVE-2026-31958","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":89,"n_references":1,"next":{"headline":"SSRF in Quill via unvalidated URL from Apple notarization log retrieval","id":"CVE-2026-31959"},"packages":[{"ecosystem":"PyPI","fixed":["6.5.5"],"introduced":["0"],"last_affected":[],"package":"tornado","purl":null,"source":"GHSA-qjxf-f2mg-c6mc"},{"ecosystem":"PyPI","fixed":["6.5.5"],"introduced":["0"],"last_affected":[],"package":"tornado","purl":"pkg:pypi/tornado","source":"GHSA-qjxf-f2mg-c6mc"},{"ecosystem":"PyPI","fixed":["6.5.5"],"introduced":["0"],"last_affected":[],"package":"tornado","purl":"pkg:pypi/tornado","source":"PYSEC-2026-140"},{"ecosystem":"AlmaLinux:8","fixed":["0.10.18-2.el8_10.9.alma.1"],"introduced":["0"],"last_affected":[],"package":"pcs","purl":"pkg:rpm/almalinux/pcs","source":"ALSA-2026:8093"},{"ecosystem":"AlmaLinux:8","fixed":["0.10.18-2.el8_10.9.alma.1"],"introduced":["0"],"last_affected":[],"package":"pcs-snmp","purl":"pkg:rpm/almalinux/pcs-snmp","source":"ALSA-2026:8093"},{"ecosystem":"Red Hat:enterprise_linux:8::highavailability","fixed":["0:0.10.18-2.el8_10.9"],"introduced":["0"],"last_affected":[],"package":"pcs","purl":"pkg:rpm/redhat/pcs","source":"RHSA-2026:8093"},{"ecosystem":"Red Hat:enterprise_linux:8::highavailability","fixed":["0:0.10.18-2.el8_10.9"],"introduced":["0"],"last_affected":[],"package":"pcs-snmp","purl":"pkg:rpm/redhat/pcs-snmp","source":"RHSA-2026:8093"},{"ecosystem":"Red Hat:enterprise_linux:8::resilientstorage","fixed":["0:0.10.18-2.el8_10.9"],"introduced":["0"],"last_affected":[],"package":"pcs","purl":"pkg:rpm/redhat/pcs","source":"RHSA-2026:8093"},{"ecosystem":"Red Hat:enterprise_linux:8::resilientstorage","fixed":["0:0.10.18-2.el8_10.9"],"introduced":["0"],"last_affected":[],"package":"pcs-snmp","purl":"pkg:rpm/redhat/pcs-snmp","source":"RHSA-2026:8093"},{"ecosystem":"Rocky Linux:8","fixed":["0:0.10.18-2.el8_10.9"],"introduced":["0"],"last_affected":[],"package":"pcs","purl":"pkg:rpm/rocky-linux/pcs?distro=rocky-linux-8\u0026epoch=0","source":"RLSA-2026:8093"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["1.0.10-90002.3.6.1"],"introduced":["0"],"last_affected":[],"package":"golang-github-lusitaniae-apache_exporter","purl":"pkg:rpm/suse/golang-github-lusitaniae-apache_exporter\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["3.11.13-90002.4.9.1"],"introduced":["0"],"last_affected":[],"package":"saltbundlepy","purl":"pkg:rpm/suse/saltbundlepy\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["3.11.13-90002.4.9.1"],"introduced":["0"],"last_affected":[],"package":"saltbundlepy-core","purl":"pkg:rpm/suse/saltbundlepy-core\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["0.45.1-90002.3.9.2"],"introduced":["0"],"last_affected":[],"package":"saltbundlepy-m2crypto","purl":"pkg:rpm/suse/saltbundlepy-m2crypto\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["25.1.2-90002.3.9.1"],"introduced":["0"],"last_affected":[],"package":"saltbundlepy-pyzmq","purl":"pkg:rpm/suse/saltbundlepy-pyzmq\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["3.19.1-90002.3.6.1"],"introduced":["0"],"last_affected":[],"package":"saltbundlepy-simplejson","purl":"pkg:rpm/suse/saltbundlepy-simplejson\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["6.3.2-90002.4.6.2"],"introduced":["0"],"last_affected":[],"package":"saltbundlepy-tornado","purl":"pkg:rpm/suse/saltbundlepy-tornado\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["5.1.13-90002.3.9.1"],"introduced":["0"],"last_affected":[],"package":"spacecmd","purl":"pkg:rpm/suse/spacecmd\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["5.1.26-90002.3.9.1"],"introduced":["0"],"last_affected":[],"package":"uyuni-tools","purl":"pkg:rpm/suse/uyuni-tools\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","fixed":["3006.0-90002.5.12.2"],"introduced":["0"],"last_affected":[],"package":"venv-salt-minion","purl":"pkg:rpm/suse/venv-salt-minion\u0026distro=SUSE:EL-9:Update:Products:MultiLinuxManagerTools:Update","source":"SUSE-SU-2026:1519-1"},{"ecosystem":"SUSE:Linux 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SP7","fixed":["4.5.3-150000.3.19.1"],"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-2026:1171-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP7","fixed":["6.3.2-150400.9.15.1"],"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-2026:1064-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","fixed":["4.5.3-150000.3.19.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS","source":"SUSE-SU-2026:1171-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","fixed":["6.3.2-150400.9.15.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS","source":"SUSE-SU-2026:1064-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","fixed":["4.5.3-150000.3.19.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS","source":"SUSE-SU-2026:1171-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","fixed":["6.3.2-150400.9.15.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS","source":"SUSE-SU-2026:1064-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","fixed":["4.5.3-150000.3.19.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado","purl":"pkg:rpm/suse/python-tornado\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS","source":"SUSE-SU-2026:1171-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","fixed":["6.3.2-150400.9.15.1"],"introduced":["0"],"last_affected":[],"package":"python-tornado6","purl":"pkg:rpm/suse/python-tornado6\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS","source":"SUSE-SU-2026:1064-1"}],"prev":{"headline":"Himmelblau unset domain configuration can allow any-tenant authentication at first login for remote deployments","id":"CVE-2026-31957"},"products":["tornado"],"published":"2026-03-11","related":[{"cvss_score":7.5,"headline":"Tornado is Vulnerable to Quadratic DoS via Repeated Header Coalescing","id":"CVE-2025-67725","kev_date_added":null,"published":"2025-12-12"},{"cvss_score":7.5,"headline":"Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters","id":"CVE-2025-67726","kev_date_added":null,"published":"2025-12-12"},{"cvss_score":7.5,"headline":"Tornado has HTTP cookie parsing DoS vulnerability","id":"CVE-2024-52804","kev_date_added":null,"published":"2024-11-22"},{"cvss_score":7.2,"headline":"Tornado has incomplete validation of cookie attributes","id":"CVE-2026-35536","kev_date_added":null,"published":"2026-04-03"},{"cvss_score":6.5,"headline":"Tornado XSRF cookie allows side-channel attack against TLS (BREACH attack)","id":"CVE-2014-9720","kev_date_added":null,"published":"2020-01-24"},{"cvss_score":6.1,"headline":"Open redirect in Tornado","id":"CVE-2023-28370","kev_date_added":null,"published":"2023-05-25"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"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":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"BSD","name":"Rocky Linux","prefix":"RLSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"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":"2026-04-01","vendors":["tornadoweb"]},"summary":"Attackers can cause denial of service in Tornado web framework by sending multipart requests with excessive parts, blocking the main thread.","url":"https://insights.sbomify.com/CVE-2026-31958/"}