Path Traversal in Golang Go
CVE-2026-27139
On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the returned FileInfo could reference a file outside of the Root in which the File was opened. The impact of this escape is limited to reading metadata provided by lstat from arbitrary locations on the filesystem without permitting reading or writing files outside the root.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.001 (1.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.001 · change: -0.001
Affected products
- Golang Go — versions 1.26.0
- Go Standard Library OS — versions 0, 1.26.0-0
Weakness classification (CWE)
References
- groups.google.com/g/golang-announce/c/EdhZqrQ98hk (Release Notes)
- go.dev/issue/77827 (Issue Tracking)
- go.dev/cl/749480 (Mailing List)
- pkg.go.dev/vuln/GO-2026-4602 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-27139?
- CVE-2026-27139 is a low-severity vulnerability in Golang Go, classified under Path Traversal. CVSS score: 2.5/10. Published 2026-03-06.
- How severe is CVE-2026-27139?
- Low severity. CVSS v3 base score is 2.5 out of 10.