GO-2026-6602

vendorUSosv

Checksum database bypass for golang.org/toolchain in cmd/go

view advisory published 2026-10-08Licence: per source

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-94447US	—	0.10% (1st)	—	2026-10-08
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…

references

External citations — patches, advisories, analysis.

https://go.dev/cl/840785FIX
https://go.dev/issue/81834REPORT
https://groups.google.com/g/golang-announce/c/U2fTuyDJznIWEB

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