--- 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' tags: - nvd - osv - go - csaf - vex - red-hat epss: 0.00182 epssPercentile: 0.0691 aliases: - GO-2026-4970 - BIT-golang-2026-39822 ecosystem: go ingestedAt: '2026-07-09T18:56:37.033Z' --- ## Overview 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 - `go >= 1.24.0, < 1.25.12` - `go >= 1.26.0, < 1.26.5` - `go = 1.27` ## Remediation Upgrade past the affected range: - `go 1.26.5` ## Package advisory (CVE-2026-39822) Affected packages: - `stdlib >= 1.27.0-0, < 1.27.0-rc.2` Patched in: - `stdlib 1.27.0-rc.2` Source: https://osv.dev/vulnerability/GO-2026-4970 ## Vendor advisories - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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: Red Hat Ceph Storage 7, Red Hat Ceph Storage 8, Compliance Operator, ExternalDNS Operator, … · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39822.json) - **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) - **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)