GO-2026-4864

See a problem?
Please try reporting it to the source first.

Source

https://pkg.go.dev/vuln/GO-2026-4864

Import Source

https://vuln.go.dev/ID/GO-2026-4864.json

JSON Data

https://api.osv.dev/v1/vulns/GO-2026-4864

Aliases

CVE-2026-32282

Published

2026-04-07T22:53:49Z

Modified

2026-04-08T01:15:15.140472Z

Summary

TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix

Details

On Linux, if the target of Root.Chmod is replaced with a symlink while the chmod operation is in progress, Chmod can operate on the target of the symlink, even when the target lies outside the root.

The Linux fchmodat syscall silently ignores the ATSYMLINKNOFOLLOW flag, which Root.Chmod uses to avoid symlink traversal. Root.Chmod checks its target before acting and returns an error if the target is a symlink lying outside the root, so the impact is limited to cases where the target is replaced with a symlink between the check and operation.

Database specific

{
    "review_status": "REVIEWED",
    "url": "https://pkg.go.dev/vuln/GO-2026-4864"
}

References

Credits

- Uuganbayar Lkhamsuren (https://github.com/uug4na)

Affected packages

Go / stdlib

Package

Name: stdlib; View open source insights on deps.dev
Purl: pkg:golang/stdlib

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.25.9

Introduced

1.26.0-0

Fixed

1.26.2

Ecosystem specific

{
    "imports": [
        {
            "path": "internal/syscall/unix",
            "symbols": [
                "Fchmodat"
            ],
            "goos": [
                "linux"
            ]
        }
    ]
}

Database specific

source

"https://vuln.go.dev/ID/GO-2026-4864.json"