| id: GO-2026-4970 |
| modules: |
| - module: std |
| versions: |
| - fixed: 1.25.12 |
| - introduced: 1.26.0-0 |
| - fixed: 1.26.5 |
| - introduced: 1.27.0-0 |
| - fixed: 1.27.0-rc.2 |
| vulnerable_at: 1.27.0-rc.1 |
| packages: |
| - package: os |
| symbols: |
| - rootOpenFileNolog |
| - openRootInRoot |
| derived_symbols: |
| - OpenInRoot |
| - Root.Create |
| - Root.Open |
| - Root.OpenFile |
| - Root.OpenRoot |
| - Root.ReadFile |
| - Root.WriteFile |
| - rootFS.Open |
| - rootFS.ReadDir |
| - rootFS.ReadFile |
| summary: Root escape via symlink plus trailing slash in os |
| description: | |
| 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. |
| credits: |
| - Mundur (https://github.com/M0nd0R) |
| references: |
| - report: https://go.dev/issue/79005 |
| - web: https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc |
| - fix: https://go.dev/cl/797880 |
| cve_metadata: |
| id: CVE-2026-39822 |
| cwe: 'CWE-61: UNIX Symbolic Link (Symlink) Following' |
| source: |
| id: go-security-team |
| review_status: REVIEWED |
