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

2026-08-14T10:42:16.677296862Z

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

{
    "review_status": "REVIEWED",
    "url": "https://pkg.go.dev/vuln/GO-2026-4981"
}

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

Database specific

source

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