Symlink Attack Affecting std/os package, versions <1.25.12>=1.26.0-0 <1.26.5>=1.27.0-0 <1.27.0-rc.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published9 Jul 2026
- disclosed7 Jul 2026
- creditMundur
Introduced: 7 Jul 2026
CVE-2026-39822 (opens in a new tab)How to fix?
Upgrade std/os to version 1.25.12, 1.26.5, 1.27.0-rc.2 or higher.
Overview
std/os is a Go standard library package std/os
Affected versions of this package are vulnerable to Symlink Attack.
Go Vulnerability Report:
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.