Auth bypass in Golang Go
CVE-2026-27140
SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001
Affected products
- Golang Go
- Go Toolchain Cmd/go — versions 0, 1.26.0-0
Weakness classification (CWE)
References
- go.dev/cl/763768 (Release Notes)
- go.dev/issue/78335 (Issue Tracking)
- groups.google.com/g/golang-announce/c/0uYbvbPZRWU (Mailing List, Release Notes)
- pkg.go.dev/vuln/GO-2026-4871 (Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-27140?
- CVE-2026-27140 is a high-severity vulnerability in Golang Go, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-04-08.
- How severe is CVE-2026-27140?
- High severity. CVSS v3 base score is 8.8 out of 10.