{"answers":{"affected":"16 open source packages ship an affected version, including symfony/symfony and symfony/yaml.","exploited":"There is no known exploitation of CVE-2026-109413 in the wild and no public exploit code.","fix":"Upgrade symfony/symfony to a fixed version for your release line: 5.4.54, 6.4.45, 7.4.18 or 8.1.6.","what":"CVE-2026-109413 is a high-severity denial of service vulnerability in sensiolabs symfony, published on 15 Oct 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-2026-109413 and fix it if it is affected.\n\nWhat it is: CVE-2026-109413 is a high-severity denial of service vulnerability in sensiolabs symfony, published on 15 Oct 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-2026-109413 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- symfony/symfony (Packagist): affected from 2.0.0; fixed in 5.4.54\n- symfony/symfony (Packagist): affected from 2.0.0; fixed in 5.4.54\n- symfony/symfony (Packagist): affected from 6.0.0; fixed in 6.4.45\n- symfony/symfony (Packagist): affected from 6.0.0; fixed in 6.4.45\n- symfony/symfony (Packagist): affected from 7.0.0; fixed in 7.4.18\n- symfony/symfony (Packagist): affected from 7.0.0; fixed in 7.4.18\n- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.1.6\n- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.1.6\n- symfony/yaml (Packagist): affected from 2.0.0; fixed in 5.4.54\n- symfony/yaml (Packagist): affected from 2.0.0; fixed in 5.4.54\n- symfony/yaml (Packagist): affected from 6.0.0; fixed in 6.4.45\n- symfony/yaml (Packagist): affected from 6.0.0; fixed in 6.4.45\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-2026-109413/ (Markdown: https://insights.sbomify.com/CVE-2026-109413/index.md)","id":"CVE-2026-109413","markdown":"https://insights.sbomify.com/CVE-2026-109413/index.md","name":"CVE-2026-109413","record":{"aliases":["CLSA-2026-1792575614","DEBIAN-CVE-2026-109413","GHSA-2v3c-qxhr-7vpv","UBUNTU-CVE-2026-109413"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Symfony YAML library","requires_auth":"none","summary":"An attacker can crash the application by sending a YAML document with deeply nested inline collections, causing unbounded recursion and stack exhaustion.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Checkmarx","cpe":[],"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-674","name":"Uncontrolled Recursion"}],"description":"In Symfony YAML prior to versions 5.4.54, 6.4.45, 7.4.18, and 8.1.6, Yaml\\Parser::lexInlineStructure() recursed through lexInlineMapping() and lexInlineSequence() for every { and [ of an inline collection, without entering the nesting level that the rest of the parser bounds with maxNestingLevel. A document made of deeply nested inline collections, such as [[[[...]]]], exhausted the stack while it was being lexed: depending on the PHP version and its stack settings, the process crashed or the request ended with a fatal error.\n\nAny code parsing untrusted YAML is affected. That includes #[MapRequestPayload] when the Yaml component is installed and the endpoint does not restrict acceptFormat: a single unauthenticated request with a YAML content type is enough.\n\nThis issue affects symfony/yaml through v5.4.53, v6.0.0-BETA1 through v6.4.44, v7.0.0-BETA1 through v7.4.17, and v8.0.0-BETA1 through v8.1.5.","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: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process","id":"CVE-2026-109413","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":16,"n_references":3,"next":{"headline":"Vitepos \u003c= 3.6.1 - Authenticated (Vendor+) SQL Injection via 'src_by[].val' Parameter via 'bt' Operator","id":"CVE-2026-109414"},"packages":[{"ecosystem":"Packagist","fixed":["5.4.54"],"introduced":["2.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["5.4.54"],"introduced":["2.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["6.4.45"],"introduced":["6.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["6.4.45"],"introduced":["6.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["7.4.18"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["7.4.18"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["8.1.6"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["8.1.6"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["5.4.54"],"introduced":["2.0.0"],"last_affected":[],"package":"symfony/yaml","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["5.4.54"],"introduced":["2.0.0"],"last_affected":[],"package":"symfony/yaml","purl":"pkg:composer/symfony/yaml","source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["6.4.45"],"introduced":["6.0.0"],"last_affected":[],"package":"symfony/yaml","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["6.4.45"],"introduced":["6.0.0"],"last_affected":[],"package":"symfony/yaml","purl":"pkg:composer/symfony/yaml","source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["7.4.18"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/yaml","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["7.4.18"],"introduced":["7.0.0"],"last_affected":[],"package":"symfony/yaml","purl":"pkg:composer/symfony/yaml","source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["8.1.6"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/yaml","purl":null,"source":"GHSA-2v3c-qxhr-7vpv"},{"ecosystem":"Packagist","fixed":["8.1.6"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/yaml","purl":"pkg:composer/symfony/yaml","source":"GHSA-2v3c-qxhr-7vpv"}],"prev":{"headline":"Information disclosure in Neurons Patch for Intune","id":"CVE-2026-109412"},"products":["symfony"],"published":"2026-10-15","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":"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":"2026-10-15","vendors":["sensiolabs"]},"summary":"An attacker can crash the application by sending a YAML document with deeply nested inline collections, causing unbounded recursion and stack exhaustion.","url":"https://insights.sbomify.com/CVE-2026-109413/"}