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CVE-2026-39822

39
FAUCET Score

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.

First published: Jul 8, 2026Last modified: Jul 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.25.12CPE matchmatch criteria
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
>= 1.26.0, < 1.26.5CPE matchmatch criteria
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
1.27CPE matchmatch criteria
cpe:2.3:a:golang:go:1.27:rc1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.23%
Probability of exploitation in next 30 days
EPSS Percentile
14.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0023 is in the 45th percentile among its peer group of 17,061 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

microsoft2026-Jul/CVE-2026-39822Important

Root escape via symlink plus trailing slash in os

Jul 14, 2026

References

go.dev / cl/797880
Patch
go.dev / issue/79005
Issue TrackingPatch
groups.google.com / g/golang-announce/c/OrmQE_Yp5Sc
Mailing ListPatchVendor Advisory
pkg.go.dev / vuln/GO-2026-4970
Vendor Advisory