CVE-2026-109413

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-109413", "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "state": "PUBLISHED", "assignerShortName": "Checkmarx", "dateReserved": "2026-10-12T15:28:55.069Z", "datePublished": "2026-10-15T14:57:00.211Z", "dateUpdated": "2026-10-15T18:06:55.183Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "shortName": "Checkmarx", "dateUpdated": "2026-10-15T15:29:00.531Z"}, "title": "Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-674", "description": "CWE-674 Uncontrolled Recursion", "type": "CWE"}]}], "affected": [{"vendor": "sensiolabs", "product": "symfony", "collectionURL": "https://packagist.org/packages/symfony/yaml", "packageName": "symfony/yaml", "repo": "https://github.com/symfony/yaml", "modules": ["Symfony\\\\Component\\\\Yaml\\\\Parser::lexInlineStructure()"], "versions": [{"status": "affected", "version": "0", "lessThan": "v5.4.54", "versionType": "git"}, {"status": "affected", "version": "v6.0.0-BETA1", "lessThan": "v6.4.45", "versionType": "git"}, {"status": "affected", "version": "v7.0.0-BETA1", "lessThan": "v7.4.18", "versionType": "git"}, {"status": "affected", "version": "v8.0.0-BETA1", "lessThan": "v8.1.6", "versionType": "git"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "v5.4.54"}, {"vulnerable": true, "criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "versionStartIncluding": "v6.0.0-beta1", "versionEndExcluding": "v6.4.45"}, {"vulnerable": true, "criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "versionStartIncluding": "v7.0.0-beta1", "versionEndExcluding": "v7.4.18"}, {"vulnerable": true, "criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "versionStartIncluding": "v8.0.0-beta1", "versionEndExcluding": "v8.1.6"}]}]}], "descriptions": [{"lang": "en", "value": "In Symfony YAML prior to versions\u00a05.4.54,\u00a06.4.45,\u00a07.4.18, and\u00a08.1.6,\u00a0Yaml\\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\n\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\n\n\nThis issue affects symfony/yaml\u00a0through v5.4.53, v6.0.0-BETA1 through\u00a0v6.4.44, v7.0.0-BETA1 through\u00a0v7.4.17, and v8.0.0-BETA1 through\u00a0v8.1.5.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>In Symfony YAML prior to versions&nbsp;<span>5.4.54,&nbsp;</span><span>6.4.45,&nbsp;</span><span>7.4.18, and&nbsp;</span><span>8.1.6,&nbsp;</span><code>Yaml\\Parser::lexInlineStructure()</code><span> recursed through </span><code>lexInlineMapping()</code><span> and </span><code>lexInlineSequence()</code><span> for every </span><code>{</code><span> and </span><code>[</code><span> of an inline collection, without entering the nesting level that the rest of the parser bounds with </span><code>maxNestingLevel</code><span>. A document made of deeply nested inline collections, such as </span><code>[[[[...]]]]</code><span>, 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.</span></p><p>Any code parsing untrusted YAML is affected. That includes <code>#[MapRequestPayload]</code> when the Yaml component is installed and the endpoint does not restrict <code>acceptFormat</code>: a single unauthenticated request with a YAML content type is enough.</p><p>This issue affects <code>symfony/yaml</code>&nbsp;through v5.4.53, v6.0.0-BETA1 through&nbsp;v6.4.44, v7.0.0-BETA1 through&nbsp;v7.4.17, and v8.0.0-BETA1 through&nbsp;v8.1.5.</p>"}]}], "references": [{"url": "https://github.com/symfony/symfony/security/advisories/GHSA-2v3c-qxhr-7vpv", "tags": ["third-party-advisory"]}, {"url": "https://symfony.com/blog/cve-2026-109413-unbounded-recursion-in-the-yaml-inline-lexer-lets-a-single-document-crash-the-process", "tags": ["vendor-advisory"]}, {"url": "https://github.com/symfony/symfony/pull/65688", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "vectorString": "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"}}], "credits": [{"lang": "en", "value": "Nicolas Grekas", "type": "remediation developer"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-15T18:06:37.552332Z", "id": "CVE-2026-109413", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T18:06:55.183Z"}}]}}

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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\n\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\n\n\nThis issue affects symfony/yaml\u00a0through v5.4.53, v6.0.0-BETA1 through\u00a0v6.4.44, v7.0.0-BETA1 through\u00a0v7.4.17, and v8.0.0-BETA1 through\u00a0v8.1.5.", "supportingMedia": [{"type": "text/html", "value": "<p>In Symfony YAML prior to versions&nbsp;<span>5.4.54,&nbsp;</span><span>6.4.45,&nbsp;</span><span>7.4.18, and&nbsp;</span><span>8.1.6,&nbsp;</span><code>Yaml\\Parser::lexInlineStructure()</code><span> recursed through </span><code>lexInlineMapping()</code><span> and </span><code>lexInlineSequence()</code><span> for every </span><code>{</code><span> and </span><code>[</code><span> of an inline collection, without entering the nesting level that the rest of the parser bounds with </span><code>maxNestingLevel</code><span>. A document made of deeply nested inline collections, such as </span><code>[[[[...]]]]</code><span>, 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.</span></p><p>Any code parsing untrusted YAML is affected. That includes <code>#[MapRequestPayload]</code> when the Yaml component is installed and the endpoint does not restrict <code>acceptFormat</code>: a single unauthenticated request with a YAML content type is enough.</p><p>This issue affects <code>symfony/yaml</code>&nbsp;through v5.4.53, v6.0.0-BETA1 through&nbsp;v6.4.44, v7.0.0-BETA1 through&nbsp;v7.4.17, and v8.0.0-BETA1 through&nbsp;v8.1.5.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-674", "description": "CWE-674 Uncontrolled Recursion"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v5.4.54", "versionStartIncluding": "0"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v6.4.45", "versionStartIncluding": "v6.0.0-beta1"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v7.4.18", "versionStartIncluding": "v7.0.0-beta1"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v8.1.6", "versionStartIncluding": "v8.0.0-beta1"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "shortName": "Checkmarx", "dateUpdated": "2026-10-15T15:29:00.531Z"}}}, "cveMetadata": {"cveId": "CVE-2026-109413", "state": "PUBLISHED", "dateUpdated": "2026-10-15T18:06:55.183Z", "dateReserved": "2026-10-12T15:28:55.069Z", "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "datePublished": "2026-10-15T14:57:00.211Z", "assignerShortName": "Checkmarx"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://packagist.org/packages/symfony/yaml", "defaultStatus": "unaffected", "modules": ["Symfony\\\\Component\\\\Yaml\\\\Parser::lexInlineStructure()"], "packageName": "symfony/yaml", "product": "symfony", "repo": "https://github.com/symfony/yaml", "vendor": "sensiolabs", "versions": [{"lessThan": "v5.4.54", "status": "affected", "version": "0", "versionType": "git"}, {"lessThan": "v6.4.45", "status": "affected", "version": "v6.0.0-BETA1", "versionType": "git"}, {"lessThan": "v7.4.18", "status": "affected", "version": "v7.0.0-BETA1", "versionType": "git"}, {"lessThan": "v8.1.6", "status": "affected", "version": "v8.0.0-BETA1", "versionType": "git"}]}], "source": "596c5446-0ce5-4ba2-aa66-48b3b757a647"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Symfony YAML prior to versions\u00a05.4.54,\u00a06.4.45,\u00a07.4.18, and\u00a08.1.6,\u00a0Yaml\\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\n\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\n\n\nThis issue affects symfony/yaml\u00a0through v5.4.53, v6.0.0-BETA1 through\u00a0v6.4.44, v7.0.0-BETA1 through\u00a0v7.4.17, and v8.0.0-BETA1 through\u00a0v8.1.5."}], "id": "CVE-2026-109413", "lastModified": "2026-10-16T16:00:33.533", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-109413", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T18:06:37.552332Z", "version": "2.0.3"}}]}, "published": "2026-10-15T15:17:24.993", "references": [{"source": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "url": "https://github.com/symfony/symfony/pull/65688"}, {"source": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "url": "https://github.com/symfony/symfony/security/advisories/GHSA-2v3c-qxhr-7vpv"}, {"source": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "url": "https://symfony.com/blog/cve-2026-109413-unbounded-recursion-in-the-yaml-inline-lexer-lets-a-single-document-crash-the-process"}], "sourceIdentifier": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "type": "Secondary"}]}

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