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CVE-2026-39817— Invoking "go tool pack" does not sanitize output paths 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，该漏洞源于未清理输出文件名，提取恶意归档文件时可能将文件写入文件系统的任意位置。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
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-2026-39817

Vulnerability Information
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Vulnerability Title
Invoking "go tool pack" does not sanitize output paths in cmd/go
Source: CVE Program / CVE List V5
Vulnerability Description
The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.
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，该漏洞源于未清理输出文件名，提取恶意归档文件时可能将文件写入文件系统的任意位置。
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-2026-39817

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III. Intelligence Information for CVE-2026-39817

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Patches & Fixes for CVE-2026-39817 (1)

Vendor Advisories for CVE-2026-39817 (1)

Vendor Pages for CVE-2026-39817 (1)

Other References for CVE-2026-39817 (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-2026-39819 Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go

IV. Related Vulnerabilities

Same product: cmd/go
Same vendor: Go toolchain

V. Comments for CVE-2026-39817

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