{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81726", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-27T11:15:29.420Z", "datePublished": "2026-08-27T14:51:18.838Z", "dateUpdated": "2026-08-27T19:29:23.489Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-08-27T14:51:18.838Z"}, "datePublic": "2026-08-12T00:00:00.000Z", "title": "NLTK through 3.10.3 Path Traversal via Model-Artifact APIs", "descriptions": [{"lang": "en", "value": "NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "External Control of File Name or Path", "cweId": "CWE-73", "type": "CWE"}]}], "affected": [{"vendor": "nltk", "product": "nltk", "defaultStatus": "unaffected", "packageURL": "pkg:pypi/nltk", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThanOrEqual": "3.10.3"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*", "versionEndIncluding": "3.10.3"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.3, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "LOW", "baseScore": 7, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-8mgp-746c-j5xp)"}, {"name": "VulnCheck Advisory: NLTK through 3.10.3 Path Traversal via Model-Artifact APIs", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis"}], "x_generator": {"engine": "vulncheck-endgame"}, "x_gcve": [{"vulnId": "CVE-2026-81726", "recordType": "advisory"}]}, "adp": [{"references": [{"url": "https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-27T19:29:05.374521Z", "id": "CVE-2026-81726", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"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": "2026-08-27T19:29:23.489Z"}}]}, "vulnerability-lookup:meta": {"epss": {"cve": "CVE-2026-81726", "date": "2026-10-22", "epss": "0.00339", "percentile": "0.26134"}, "nvd": "{\"cve\":{\"id\":\"CVE-2026-81726\",\"sourceIdentifier\":\"disclosure@vulncheck.com\",\"published\":\"2026-08-27T17:21:03.387\",\"lastModified\":\"2026-08-31T19:06:49.993\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.\"}],\"affected\":[{\"source\":\"disclosure@vulncheck.com\",\"affectedData\":[{\"vendor\":\"nltk\",\"product\":\"nltk\",\"defaultStatus\":\"unaffected\",\"packageURL\":\"pkg:pypi/nltk\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"3.10.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"disclosure@vulncheck.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/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\",\"baseScore\":8.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"LOW\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"disclosure@vulncheck.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.2,\"impactScore\":4.7}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-27T19:29:05.374521Z\",\"id\":\"CVE-2026-81726\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"disclosure@vulncheck.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-73\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"3.10.3\",\"matchCriteriaId\":\"907206A4-3761-4899-9D77-F79C72F6229B\"}]}]}],\"references\":[{\"url\":\"https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp\",\"source\":\"disclosure@vulncheck.com\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]},{\"url\":\"https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis\",\"source\":\"disclosure@vulncheck.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]}]}}", "redhat_vex": {"aggregate_severity": "Important", "current_release_date": "2026-10-21T19:08:11+00:00", "cve": "CVE-2026-81726", "id": "CVE-2026-81726", "initial_release_date": "2026-08-27T14:51:18.838000+00:00", "product_status:fixed": "21", "product_status:known_affected": "8", "product_status:known_not_affected": "676", "source": "Red Hat CSAF VEX", "status": "final", "title": "nltk: NLTK: Unauthorized file access via path traversal in model-artifact APIs", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81726.json", "version": "3"}}}