CVE-2026-39819— Invoking "go bug" follows symlinks in predictable temporary filenames 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，该漏洞源于在系统临时目录中写入两个可预测名称的文件，攻击者可通过创建符号链接导致go bug覆盖目标文件。
Possible ATT&CK Techniques 2 AI
T1083 · File and Directory Discovery T1552.005 · Cloud Instance Metadata APIAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go toolchain | cmd/go | < 1.25.10 |
affected |
1.26.0-0< 1.26.3 |
affected |
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I. Basic Information for CVE-2026-39819
Vulnerability Information
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Vulnerability Title
Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go
Source: CVE Program / CVE List V5
Vulnerability Description
The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.
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，该漏洞源于在系统临时目录中写入两个可预测名称的文件，攻击者可通过创建符号链接导致go bug覆盖目标文件。
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 ~ 1.25.10 | - |
|
II. Public POCs for CVE-2026-39819
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-39819 (1)
Vendor Advisories for CVE-2026-39819 (1)
News Coverage for CVE-2026-39819 (1)
Vendor Pages for CVE-2026-39819 (1)
Same Patch Batch · Go toolchain · 2026-05-07 · 3 CVEs total
| CVE-2026-42501 | Malicious module proxy can bypass checksum database in cmd/go | |
| CVE-2026-39817 | Invoking "go tool pack" does not sanitize output paths in cmd/go |
IV. Related Vulnerabilities
Same product: cmd/go
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CVE-2026-56864
Ignore unrelated, unauthenticated hashes in Lookup in golang -
CVE-2026-56865
Fix transparency log tile verification bypass in golang.org/ -
CVE-2026-42501
Malicious module proxy can bypass checksum database in cmd/g -
CVE-2026-39817
Invoking "go tool pack" does not sanitize output paths in cm -
CVE-2026-27140
Code execution vulnerability in SWIG code generation in cmd/
Same vendor: Go toolchain
-
CVE-2026-56864
Ignore unrelated, unauthenticated hashes in Lookup in golang -
CVE-2026-56865
Fix transparency log tile verification bypass in golang.org/ -
CVE-2026-42501
Malicious module proxy can bypass checksum database in cmd/g -
CVE-2026-39817
Invoking "go tool pack" does not sanitize output paths in cm -
CVE-2026-27140
Code execution vulnerability in SWIG code generation in cmd/
V. Comments for CVE-2026-39819
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