{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-109380", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-12T14:23:25.691Z", "datePublished": "2026-10-12T20:55:11.774Z", "dateUpdated": "2026-10-12T20:55:11.774Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-12T20:55:11.774Z"}, "datePublic": "2026-10-08T00:00:00.000Z", "title": "modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field", "descriptions": [{"lang": "en", "value": "modern-tar 0.3.5 through 0.8.5 contains a memory exhaustion vulnerability that allows attackers to produce negative entry sizes via non-octal bytes parsed by readOctal(). Attackers can supply a crafted, optionally gzip-compressed, archive to unpackTar() that buffers chunks indefinitely, exhausting process memory and suppressing later entries."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Validation of Specified Quantity in Input", "cweId": "CWE-1284", "type": "CWE"}]}], "affected": [{"vendor": "ayuhito", "product": "modern-tar", "defaultStatus": "unaffected", "versions": [{"version": "0.3.5", "status": "affected", "versionType": "semver", "lessThanOrEqual": "0.8.5"}], "packageURL": "pkg:npm/modern-tar", "repo": "https://github.com/ayuhito/modern-tar"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/ayuhito/modern-tar/pull/195", "tags": ["issue-tracking", "patch"], "name": "GitHub Pull Request #195"}, {"url": "https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90fe416e", "tags": ["patch"], "name": "Patch Commit"}, {"url": "https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.ts", "tags": ["technical-description"], "name": "Vulnerable code in encoding.ts"}, {"url": "https://github.com/ayuhito/modern-tar", "tags": ["product"]}, {"name": "VulnCheck Advisory: modern-tar 0.3.5 through 0.8.5 Memory Exhaustion via Malformed Octal Size Field", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exhaustion-via-malformed-octal-size-field"}], "credits": [{"lang": "en", "value": "Lum Humolli", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:npm/modern-tar", "product": "modern-tar", "repo": "https://github.com/ayuhito/modern-tar", "vendor": "ayuhito", "versions": [{"lessThanOrEqual": "0.8.5", "status": "affected", "version": "0.3.5", "versionType": "semver"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "modern-tar 0.3.5 through 0.8.5 contains a memory exhaustion vulnerability that allows attackers to produce negative entry sizes via non-octal bytes parsed by readOctal(). Attackers can supply a crafted, optionally gzip-compressed, archive to unpackTar() that buffers chunks indefinitely, exhausting process memory and suppressing later entries."}], "id": "CVE-2026-109380", "lastModified": "2026-10-12T21:17:11.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "[email protected]", "type": "Primary"}], "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": "[email protected]", "type": "Secondary"}]}, "published": "2026-10-12T21:17:11.153", "references": [{"source": "[email protected]", "url": "https://github.com/ayuhito/modern-tar"}, {"source": "[email protected]", "url": "https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.ts"}, {"source": "[email protected]", "url": "https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90fe416e"}, {"source": "[email protected]", "url": "https://github.com/ayuhito/modern-tar/pull/195"}, {"source": "[email protected]", "url": "https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exhaustion-via-malformed-octal-size-field"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1284"}], "source": "[email protected]", "type": "Primary"}]}

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