{"answers":{"affected":"4 open source packages ship an affected version, including symfony/ux-live-component. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-49209 in the wild and no public exploit code.","fix":"Upgrade symfony/ux-live-component to a fixed version for your release line: 2.36.0 or 3.1.0.","what":"CVE-2026-49209 is a medium-severity denial of service vulnerability in symfony ux, published on 17 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-49209 and fix it if it is affected.\n\nWhat it is: CVE-2026-49209 is a medium-severity denial of service vulnerability in symfony ux, published on 17 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-49209 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- symfony/ux-live-component (Packagist): affected from 2.5.0; fixed in 2.36.0\n- symfony/ux-live-component (Packagist): affected from 2.5.0; fixed in 2.36.0\n- symfony/ux-live-component (Packagist): affected from 3.0.0; fixed in 3.1.0\n- symfony/ux-live-component (Packagist): affected from 3.0.0; fixed in 3.1.0\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-2026-49209/ (Markdown: https://insights.sbomify.com/CVE-2026-49209/index.md)","id":"CVE-2026-49209","markdown":"https://insights.sbomify.com/CVE-2026-49209/index.md","name":"CVE-2026-49209","record":{"aliases":["GHSA-mm82-c99c-h2cf"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Symfony UX Live Component","requires_auth":"low_privilege","summary":"An authenticated attacker can cause denial of service by submitting unbounded batch action requests, exhausting server resources.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"ux","vendor":"symfony"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"Symfony UX is a JavaScript ecosystem for Symfony. From 2.5.0 until 2.36.0 and 3.1.0, Symfony\\UX\\LiveComponent\\Controller\\BatchActionController::__invoke() iterates over the client-supplied actions array and issues a full HttpKernel sub-request for each entry; because the array size is never bounded, an authenticated client can submit a single _batch request containing thousands of actions and exhaust CPU, memory, and database connections on the application server. This issue is fixed in versions 2.36.0 and 3.1.0.","ecosystems":["Packagist"],"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":"Symfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requests","id":"CVE-2026-49209","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":4,"n_references":4,"next":{"headline":"Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag","id":"CVE-2026-49210"},"packages":[{"ecosystem":"Packagist","fixed":["2.36.0"],"introduced":["2.5.0"],"last_affected":[],"package":"symfony/ux-live-component","purl":null,"source":"GHSA-mm82-c99c-h2cf"},{"ecosystem":"Packagist","fixed":["2.36.0"],"introduced":["2.5.0"],"last_affected":[],"package":"symfony/ux-live-component","purl":"pkg:composer/symfony/ux-live-component","source":"GHSA-mm82-c99c-h2cf"},{"ecosystem":"Packagist","fixed":["3.1.0"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/ux-live-component","purl":null,"source":"GHSA-mm82-c99c-h2cf"},{"ecosystem":"Packagist","fixed":["3.1.0"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/ux-live-component","purl":"pkg:composer/symfony/ux-live-component","source":"GHSA-mm82-c99c-h2cf"}],"prev":{"headline":"Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor","id":"CVE-2026-49208"},"products":["ux"],"published":"2026-07-17","related":[{"cvss_score":6.9,"headline":"Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor","id":"CVE-2026-49208","kev_date_added":null,"published":"2026-07-17"},{"cvss_score":6.9,"headline":"Symfony UX: Information exposure via unescaped LIKE wildcards in EntitySearchUtil","id":"CVE-2026-49211","kev_date_added":null,"published":"2026-07-17"},{"cvss_score":6.9,"headline":"Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding","id":"CVE-2026-49212","kev_date_added":null,"published":"2026-07-17"},{"cvss_score":6.1,"headline":"Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses","id":"CVE-2026-55877","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":5.1,"headline":"Symfony UX: XSS in symfony/ux-autocomplete via unescaped AJAX response data","id":"CVE-2026-49216","kev_date_added":null,"published":"2026-07-17"},{"cvss_score":2.3,"headline":"Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag","id":"CVE-2026-49210","kev_date_added":null,"published":"2026-07-17"}],"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":"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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-17","vendors":["symfony"]},"summary":"An authenticated attacker can cause denial of service by submitting unbounded batch action requests, exhausting server resources.","url":"https://insights.sbomify.com/CVE-2026-49209/"}