GO-2026-4981

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Source
https://pkg.go.dev/vuln/GO-2026-4981
Import Source
https://vuln.go.dev/ID/GO-2026-4981.json
JSON Data
https://api.osv.dev/v1/vulns/GO-2026-4981
Aliases
Related
Published
2026-05-07T19:21:40Z
Modified
2026-05-11T08:11:09.084571258Z
Summary
Crash when handling long CNAME response in net
Details

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Database specific 
{
    "url": "https://pkg.go.dev/vuln/GO-2026-4981",
    "review_status": "REVIEWED"
}
References
Credits
    • hamayanhamayan

Affected packages

Go / stdlib

Package

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

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.25.10
Introduced
1.26.0-0
Fixed
1.26.3

Ecosystem specific 

{
    "imports": [
        {
            "symbols": [
                "LookupCNAME",
                "Resolver.LookupCNAME",
                "cgoResSearch"
            ],
            "path": "net"
        }
    ]
}

Database specific

source 
"https://vuln.go.dev/ID/GO-2026-4981.json"