CVE-2026-39822
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
ProductGo
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-61CWE-61
How to fix
Update
- golang go1.25.12, 1.26.5 or later
- stdlib1.25.12, 1.26.5, 1.27.0-rc.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| golang go | 1.24.0 ≤ v < 1.25.12, 1.26.0 ≤ v < 1.26.5, 1.27 | 1.25.12, 1.26.5 |
| stdlibGo | v < 1.25.12, 1.26.0-0 ≤ v < 1.26.5, 1.27.0-0 ≤ v < 1.27.0-rc.2 | 1.25.12, 1.26.5, 1.27.0-rc.2 |
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