High 7.8Published Oct 8, 2026

CVE-2026-94447Checksum database bypass for golang.org/toolchain in cmd/go

Updated under an hour ago (Oct 27, 2026, 1:30 AM ET)

Does this affect you?

It affects Go toolchain cmd/go. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.10%, higher than 1% of scored CVEs.

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Every CVE for Go toolchain cmd/go

Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-354
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.10% (percentile 1)
Assigned by: Go
NVD analysis: Awaiting Analysis
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Go toolchain cmd/go go_toolchain:cmd_go (from the name)	before 1.26.9; from 1.27.0-0 before 1.27.2	CNA record

References

References

https://go.dev/cl/840785
https://go.dev/issue/81834
https://groups.google.com/g/golang-announce/c/U2fTuyDJznI
https://pkg.go.dev/vuln/GO-2026-6602

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.