CVE-2026-39822: go — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.08%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-61 CWE-61

Affected Products

Vendor	Product	Versions
golang	go	< 1.25.12
golang	go	1.26.0 — 1.26.5
golang	go	All

References

Advisories & Patches

https://go.dev/cl/797880 https://go.dev/issue/79005 https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc https://pkg.go.dev/vuln/GO-2026-4970

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-39822? +

CVE-2026-39822 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-39822? +

CVE-2026-39822 affects products from golang, specifically: go. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-39822? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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