GO-2026-6180

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Source
https://pkg.go.dev/vuln/GO-2026-6180
Import Source
https://vuln.go.dev/ID/GO-2026-6180.json
JSON Data
https://api.osv.dev/v1/vulns/GO-2026-6180
Aliases
  • CVE-2026-56864
Downstream
Related
Published
2026-08-13T21:43:54Z
Modified
2026-08-14T09:41:57.749669092Z
Summary
Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb
Details

A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log.

This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be detected by evaluating the transparency log.

In order to determine if you have been affected:

rm -r go.sum go.work.sum vendor/ && go mod tidy

Database specific 
{
    "url": "https://pkg.go.dev/vuln/GO-2026-6180",
    "review_status": "REVIEWED"
}
References
Credits
    • mundur

Affected packages

Go / toolchain

Package

Name
toolchain
View open source insights on deps.dev
Purl
pkg:golang/toolchain

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.25.13
Introduced
1.26.0-0
Fixed
1.26.6
Introduced
1.27.0-0
Fixed
1.27.0-rc.3

Ecosystem specific 

{
    "imports": [
        {
            "path": "cmd/go"
        }
    ]
}

Database specific

source 
"https://vuln.go.dev/ID/GO-2026-6180.json"

Go / golang.org/x/mod

Package

Name
golang.org/x/mod
View open source insights on deps.dev
Purl
pkg:golang/golang.org/x/mod

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.40.0

Ecosystem specific 

{
    "imports": [
        {
            "path": "golang.org/x/mod/sumdb",
            "symbols": [
                "Client.Lookup"
            ]
        }
    ]
}

Database specific

source 
"https://vuln.go.dev/ID/GO-2026-6180.json"