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CVE-2026-27140— Code execution vulnerability in SWIG code generation in cmd/go

Quick assessment

Affected
Go toolchain cmd/go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于带有 go 标识与精心构造的恶意载荷的 SWIG 文件名，可引发代码走私问题，同时会在构建阶段因信任层绕过，导致任意代码执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.66% · P50

Affected Version Matrix 2

VendorProduct Version RangeStatus
Go toolchain cmd/go < 1.25.9 affected
1.26.0-0< 1.26.2 affected
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I. Basic Information for CVE-2026-27140

Vulnerability Information
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Vulnerability Title
Code execution vulnerability in SWIG code generation in cmd/go
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于带有 go 标识与精心构造的恶意载荷的 SWIG 文件名，可引发代码走私问题，同时会在构建阶段因信任层绕过，导致任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Go toolchain cmd/go 0 ~ 1.25.9 -

II. Public POCs for CVE-2026-27140

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III. Intelligence Information for CVE-2026-27140

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Vendor Advisories for CVE-2026-27140 (1)

Same Patch Batch · Go toolchain · 2026-04-08 · 3 CVEs total

CVE-2026-27144 Miscompilation allows memory corruption via CONVNOP-wrapped array copy in cmd/compile
CVE-2026-27143 Missing bound checks can lead to memory corruption in safe Go in cmd/compile

IV. Related Vulnerabilities

Same product: cmd/go
Same vendor: Go toolchain

V. Comments for CVE-2026-27140

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