{"id":"CVE-2026-39822","title":"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 /","summary":"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 o…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-61","CWE-59"],"vendor":"golang","product":"go","affected":["go >= 1.24.0, < 1.25.12","go >= 1.26.0, < 1.26.5","go = 1.27"],"patched":["go 1.26.5"],"published":"2026-07-08","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:10:20.047","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-39822","references":[{"url":"https://go.dev/cl/797880","label":"security@golang.org"},{"url":"https://go.dev/issue/79005","label":"security@golang.org"},{"url":"https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc","label":"security@golang.org"},{"url":"https://pkg.go.dev/vuln/GO-2026-4970","label":"security@golang.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39822.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-39822"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498152"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-39822"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39822"},{"url":"https://access.redhat.com/errata/RHSA-2026:66350"},{"url":"https://access.redhat.com/errata/RHSA-2026:66375"},{"url":"https://access.redhat.com/errata/RHSA-2026:57361"},{"url":"https://access.redhat.com/errata/RHSA-2026:49702"},{"url":"https://access.redhat.com/errata/RHSA-2026:38494"},{"url":"https://access.redhat.com/errata/RHSA-2026:37436"},{"url":"https://access.redhat.com/errata/RHSA-2026:38995"},{"url":"https://access.redhat.com/errata/RHSA-2026:61253"},{"url":"https://access.redhat.com/errata/RHSA-2026:57649"},{"url":"https://access.redhat.com/errata/RHSA-2026:49712"},{"url":"https://access.redhat.com/errata/RHSA-2026:38493"},{"url":"https://access.redhat.com/errata/RHSA-2026:37435"},{"url":"https://access.redhat.com/errata/RHSA-2026:38878"},{"url":"https://access.redhat.com/errata/RHSA-2026:59202"},{"url":"https://access.redhat.com/errata/RHSA-2026:59203"},{"url":"https://access.redhat.com/errata/RHSA-2026:48891"},{"url":"https://access.redhat.com/errata/RHSA-2026:36510"},{"url":"https://access.redhat.com/errata/RHSA-2026:36477"},{"url":"https://access.redhat.com/errata/RHSA-2026:54773"},{"url":"https://access.redhat.com/errata/RHSA-2026:44624"},{"url":"https://access.redhat.com/errata/RHSA-2026:53520"},{"url":"https://access.redhat.com/errata/RHSA-2026:52968"},{"url":"https://access.redhat.com/errata/RHSA-2026:50931"},{"url":"https://access.redhat.com/errata/RHSA-2026:82354"},{"url":"https://access.redhat.com/errata/RHSA-2026:82372"},{"url":"https://access.redhat.com/errata/RHSA-2026:82347"}],"tags":["nvd","osv","go","csaf","vex","red-hat"],"epss":0.00232,"epssPercentile":0.14051,"aliases":["GO-2026-4970","BIT-golang-2026-39822"],"ecosystem":"go","ingestedAt":"2026-07-09T18:56:37.033Z","slug":"CVE-2026-39822","body":"## Overview\n\nOn 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.\n\n## Affected\n\n- `go >= 1.24.0, < 1.25.12`\n- `go >= 1.26.0, < 1.26.5`\n- `go = 1.27`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `go 1.26.5`\n\n## Package advisory (CVE-2026-39822)\n\nAffected packages:\n\n- `stdlib >= 1.27.0-0, < 1.27.0-rc.2`\n\nPatched in:\n\n- `stdlib 1.27.0-rc.2`\n\nSource: https://osv.dev/vulnerability/GO-2026-4970\n\n## Vendor advisories\n\n- **RHSA-2026:66350** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:66350)\n- **RHSA-2026:66375** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:66375)\n- **RHSA-2026:57361** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:57361)\n- **RHSA-2026:49702** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-08-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:49702)\n- **RHSA-2026:38494** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:38494)\n- **RHSA-2026:37436** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:37436)\n- **RHSA-2026:38995** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:38995)\n- **RHSA-2026:61253** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61253)\n- **RHSA-2026:57649** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57649)\n- **RHSA-2026:49712** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-08-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:49712)\n- **RHSA-2026:38493** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:38493)\n- **Red Hat VEX** · Important · affected: Compliance Operator, ExternalDNS Operator, File Integrity Operator, Logging Subsystem for Red Hat OpenShift, Multicluster Engine for Kubernetes, Red Hat Advanced Cluster Management for Kubernetes 2, … · no fix planned: Logging Subsystem for Red Hat OpenShift, Red Hat Ceph Storage 7, Red Hat Ceph Storage 8, Compliance Operator, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39822.json)\n- **RHSA-2026:37435** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:37435)\n- **RHSA-2026:38878** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:38878)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":5150,"id":"CVE-2026-39822","ts":1788887250907,"field":"cvss","old":null,"new":"7.8"},{"seq":5149,"id":"CVE-2026-39822","ts":1788887250907,"field":"severity","old":"none","new":"high"},{"seq":4033,"id":"CVE-2026-39822","ts":1788886366817,"field":"cvss","old":"7.8","new":null},{"seq":4032,"id":"CVE-2026-39822","ts":1788886366817,"field":"severity","old":"high","new":"none"},{"seq":3175,"id":"CVE-2026-39822","ts":1788883133240,"field":"cvss","old":null,"new":"7.8"},{"seq":3174,"id":"CVE-2026-39822","ts":1788883133240,"field":"severity","old":"none","new":"high"}]}