Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-46600
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 20:17:01 UTC
Updated2026-08-14 16:16:55 UTC
DescriptionParsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

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

EPSS: 0.003390000 probability, percentile 0.266990000 (date 2026-08-13)

Problem Types: CWE-125 | CWE-125: Out-of-bounds Read | CWE-125 CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net affected 1.26.0-0 1.26.6 semver Not specified
CNA Go Standard Library Net affected 1.27.0-0 1.27.0-rc.3 semver Not specified
CNA Golang.orgxnet Golang.org/x/net/dns/dnsmessage affected 0.56.0 semver Not specified

References

ReferenceSourceLinkTags
pkg.go.dev/vuln/GO-2026-5942 [email protected] pkg.go.dev
groups.google.com/g/golang-announce/c/94pEornpRlI [email protected] groups.google.com
go.dev/issue/79795 [email protected] go.dev
go.dev/cl/786345 [email protected] go.dev
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: Mundur (https://github.com/M0nd0R) (en)

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