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
EPSS: 0.007 (47.5th percentile) — read the EPSS interpretation.
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.
Affected products
- Golang Go
- Go Toolchain Cmd/go — versions 0, 1.26.0-0
Weakness classification (CWE)
References
- security@golang.org (Release Notes)
- security@golang.org (Issue Tracking)
- security@golang.org (Mailing List, Release Notes)
- security@golang.org (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.