{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39822", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-04-07T18:13:03.527Z", "datePublished": "2026-07-08T15:46:27.199Z", "dateUpdated": "2026-07-08T19:39:17.341Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-07-08T15:46:27.199Z"}, "title": "Root escape via symlink plus trailing slash in os", "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."}], "affected": [{"vendor": "Go standard library", "product": "os", "collectionURL": "https://pkg.go.dev", "packageName": "os", "versions": [{"version": "0", "lessThan": "1.25.12", "status": "affected", "versionType": "semver"}, {"version": "1.26.0-0", "lessThan": "1.26.5", "status": "affected", "versionType": "semver"}, {"version": "1.27.0-0", "lessThan": "1.27.0-rc.2", "status": "affected", "versionType": "semver"}], "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"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-61: UNIX Symbolic Link (Symlink) Following"}]}], "references": [{"url": "https://go.dev/issue/79005"}, {"url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc"}, {"url": "https://go.dev/cl/797880"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4970"}], "credits": [{"lang": "en", "value": "Mundur (https://github.com/M0nd0R)"}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-61", "lang": "en", "description": "CWE-61 UNIX Symbolic Link (Symlink) Following"}]}], "metrics": [{"cvssV3_1": {"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"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-07-08T18:06:16.360721Z", "id": "CVE-2026-39822", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-08T19:39:17.341Z"}}]}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.25.12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.26.0-0,1.26.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.27.0-0,1.27.0-rc.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "os", "source": "cna", "vendor": "Go standard library"}, "product": "os", "vendor": "go_standard_library"}], "created": "2026-07-08T17:30:03.725999+00:00", "updated": "2026-07-08T17:30:03.726023+00:00", "vendors": ["go_standard_library", "go_standard_library$PRODUCT$os"]}