CVE-2026-39822

{"id": "CVE-2026-39822", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39822", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-08T18:06:16.360721Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "security@golang.org", "affectedData": [{"vendor": "Go standard library", "product": "os", "versions": [{"status": "affected", "version": "0", "lessThan": "1.25.12", "versionType": "semver"}, {"status": "affected", "version": "1.26.0-0", "lessThan": "1.26.5", "versionType": "semver"}, {"status": "affected", "version": "1.27.0-0", "lessThan": "1.27.0-rc.2", "versionType": "semver"}], "packageName": "os", "collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "programRoutines": [{"name": "rootOpenFileNolog"}, {"name": "openRootInRoot"}, {"name": "OpenInRoot"}, {"name": "Root.Create"}, {"name": "Root.Open"}, {"name": "Root.OpenFile"}, {"name": "Root.OpenRoot"}, {"name": "Root.ReadFile"}, {"name": "Root.WriteFile"}, {"name": "rootFS.Open"}, {"name": "rootFS.ReadDir"}, {"name": "rootFS.ReadFile"}]}]}], "published": "2026-07-08T17:17:21.310", "references": [{"url": "https://go.dev/cl/797880", "tags": ["Patch"], "source": "security@golang.org"}, {"url": "https://go.dev/issue/79005", "tags": ["Issue Tracking", "Patch"], "source": "security@golang.org"}, {"url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc", "tags": ["Mailing List", "Patch", "Vendor Advisory"], "source": "security@golang.org"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4970", "tags": ["Vendor Advisory"], "source": "security@golang.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-61"}]}], "descriptions": [{"lang": "en", "value": "On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open(\"symlink/\")' will open \"symlink\" even when \"symlink\" is a symbolic link pointing outside of the root."}], "lastModified": "2026-07-13T14:54:26.317", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BA474C81-2BDB-451D-BAC7-5714B4F30E1F", "versionEndExcluding": "1.25.12"}, {"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "08CDCAED-0C22-42D9-97A8-77F19DEECDB2", "versionEndExcluding": "1.26.5", "versionStartIncluding": "1.26.0"}, {"criteria": "cpe:2.3:a:golang:go:1.27:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1062DCC7-46FE-4CF5-ADEF-BEC03F8AB39E"}], "operator": "OR"}]}], "sourceIdentifier": "security@golang.org"}