Crash when handling long CNAME response in net

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Summary

CVECVE-2026-33811
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 20:16:42 UTC
Updated2026-05-12 20:23:02 UTC
DescriptionWhen using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.000180000 probability, percentile 0.047170000 (date 2026-05-12)

Problem Types: CWE-415 | CWE-415: Double Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Go All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net affected 1.25.10 semver Not specified
CNA Go Standard Library Net affected 1.26.0-0 1.26.3 semver Not specified

References

ReferenceSourceLinkTags
go.dev/issue/78803 [email protected] go.dev Issue Tracking
go.dev/cl/767860 [email protected] go.dev Patch
pkg.go.dev/vuln/GO-2026-4981 [email protected] pkg.go.dev Vendor Advisory
groups.google.com/g/golang-announce/c/qcCIEXso47M [email protected] groups.google.com Mailing List, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: hamayanhamayan (en)

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