Vulnerability Intelligence Report
Root escape via symlink plus trailing slash in os
CVE-2026-39822
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.
No Active Exploit Signals
CVSS Base Score
7.8
HIGH
Exploitability:1.9
Impact Score:5.9
EPSS Probability:0.18%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Weaknesses (CWE)
CWE-61 ↗CWE-61: UNIX Symbolic Link (Symlink) Following
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Go standard library | os | 0 < 1.25.12 (affected), 1.26.0-0 < 1.26.5 (affected), 1.27.0-0 < 1.27.0-rc.2 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.181%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Go Project · Vendor · USA |
| Reserved | 2026-04-07T18:13:03 |
| Published | 2026-07-08T15:46:27 |
| Last Updated | 2026-07-08T19:39:17 |
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