{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-49421", "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "state": "PUBLISHED", "assignerShortName": "freebsd", "dateReserved": "2026-05-29T20:24:28.616Z", "datePublished": "2026-08-19T05:25:43.003Z", "dateUpdated": "2026-08-19T05:25:43.003Z"}, "containers": {"cna": {"datePublic": "2026-06-30T20:00:00.000Z", "title": "unlinkat(2) ignores AT_RESOLVE_BENEATH flag", "references": [{"tags": ["vendor-advisory"], "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:42.unlinkat.asc"}], "affected": [{"defaultStatus": "unknown", "modules": ["libalias"], "product": "FreeBSD", "vendor": "FreeBSD", "versions": [{"status": "affected", "versionType": "release", "version": "15.1-RELEASE", "lessThan": "p1"}, {"status": "affected", "versionType": "release", "version": "15.0-RELEASE", "lessThan": "p11"}, {"status": "affected", "versionType": "release", "version": "14.4-RELEASE", "lessThan": "p7"}, {"status": "affected", "versionType": "release", "version": "14.3-RELEASE", "lessThan": "p16"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai"}], "descriptions": [{"lang": "en", "value": "The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted.\n\nA process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory. A caller relying on this flag for path containment may delete files outside the intended directory tree."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-273", "description": "CWE-273: Improper Check for Dropped Privileges", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "shortName": "freebsd", "dateUpdated": "2026-08-19T05:25:43.003Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "modules": ["libalias"], "product": "FreeBSD", "vendor": "FreeBSD", "versions": [{"lessThan": "p1", "status": "affected", "version": "15.1-RELEASE", "versionType": "release"}, {"lessThan": "p11", "status": "affected", "version": "15.0-RELEASE", "versionType": "release"}, {"lessThan": "p7", "status": "affected", "version": "14.4-RELEASE", "versionType": "release"}, {"lessThan": "p16", "status": "affected", "version": "14.3-RELEASE", "versionType": "release"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted.\n\nA process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory. A caller relying on this flag for path containment may delete files outside the intended directory tree."}], "id": "CVE-2026-49421", "lastModified": "2026-08-19T06:17:41.160", "metrics": {}, "published": "2026-08-19T06:17:41.160", "references": [{"source": "[email protected]", "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:42.unlinkat.asc"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-273"}], "source": "[email protected]", "type": "Secondary"}]}

{}

{}