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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:npm/n8n", "product": "n8n", "vendor": "n8n-io", "versions": [{"lessThan": "1.123.69", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "1.123.69", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "packageURL": "pkg:npm/n8n", "product": "n8n", "vendor": "n8n-io", "versions": [{"lessThan": "2.34.1", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "2.34.1", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "packageURL": "pkg:npm/n8n", "product": "n8n", "vendor": "n8n-io", "versions": [{"lessThan": "2.33.4", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "2.33.4", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "n8n before 1.123.69, 2.x before 2.33.4, and 2.34.x before 2.34.1 contains a regular expression denial of service (ReDoS) vulnerability in the Filter and Switch nodes, which compile user-supplied regex patterns with new RegExp() and execute them synchronously on the worker thread without complexity validation or execution timeout. A crafted regex pattern can block the worker for an extended period per data item processed, delaying other workflow executions on the same worker."}], "id": "CVE-2026-77082", "lastModified": "2026-08-20T12:16:39.717", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "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": "LOW", "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:L/UI:N/VC:N/VI:N/VA:L/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": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-08-20T12:16:39.717", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-q3fv-295f-qfpf"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/n8n-before-redos-via-filter-and-switch-node"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

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