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CVE-2026-94447— Checksum database bypass for golang.org/toolchain 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.

此前，如果用户在一个恶意的 Go 项目中进行操作，该项目定义了一个伪造的 golang.org/toolchain go.sum 条目，并且用户配置使用了其自行控制的恶意 GOMODPROXY，则该用户可以绕过预期的校验和验证。现在，我们确保对于 golang.org/toolchain，始终从网络获取规范的校验和。

AI Predicted 7.5 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-94447

Vulnerability Information
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Vulnerability Title
Checksum database bypass for golang.org/toolchain in cmd/go
Source: CVE Program / CVE List V5
Vulnerability Description
Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/toolchain go.sum entry and operates a malicious GOMODPROXY the user chooses to use can bypass the intended checksum. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Go toolchain cmd/go 0 ~ 1.26.9 -

II. Public POCs for CVE-2026-94447

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III. Intelligence Information for CVE-2026-94447

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Vendor Advisories for CVE-2026-94447 (2)

Vendor Pages for CVE-2026-94447 (1)

Other References for CVE-2026-94447 (1)

IV. Related Vulnerabilities

Same product: cmd/go
Same vendor: Go toolchain

V. Comments for CVE-2026-94447

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