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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-94447
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 23:17:05 UTC
Updated2026-10-15 16:18:24 UTC
DescriptionPreviously, 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from ADP

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.001260000 probability, percentile 0.020200000 (date 2026-10-11)

Problem Types: CWE-354 | CWE-354: Improper Validation of Integrity Check Value | CWE-354 CWE-354 Improper Validation of Integrity Check Value

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Toolchain Cmd/go affected 1.26.9 semver Not specified
CNA Go Toolchain Cmd/go affected 1.27.0-0 1.27.2 semver Not specified

References

ReferenceSourceLinkTags
pkg.go.dev/vuln/GO-2026-6602 [email protected] pkg.go.dev
groups.google.com/g/golang-announce/c/U2fTuyDJznI [email protected] groups.google.com
go.dev/cl/840785 [email protected] go.dev
go.dev/issue/81834 [email protected] go.dev
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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