CVE-2026-46600

Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://go.dev/cl/786345
https://go.dev/issue/79795
https://groups.google.com/g/golang-announce/c/94pEornpRlI
https://pkg.go.dev/vuln/GO-2026-5942

Configurations

No configuration.

History

No history.

Information

Published : 2026-07-21 20:17

Updated : 2026-08-14 16:16

NVD link : CVE-2026-46600

Mitre link : CVE-2026-46600

CVE.ORG link : CVE-2026-46600

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

{"id": "CVE-2026-46600", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46600", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-23T15:00:27.171241Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@golang.org", "affectedData": [{"vendor": "Go standard library", "product": "net", "versions": [{"status": "affected", "version": "1.26.0-0", "lessThan": "1.26.6", "versionType": "semver"}, {"status": "affected", "version": "1.27.0-0", "lessThan": "1.27.0-rc.3", "versionType": "semver"}], "packageName": "net", "collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "programRoutines": [{"name": "cgoResSearch"}, {"name": "LookupCNAME"}, {"name": "Resolver.LookupCNAME"}]}, {"vendor": "golang.org/x/net", "product": "golang.org/x/net/dns/dnsmessage", "versions": [{"status": "affected", "version": "0", "lessThan": "0.56.0", "versionType": "semver"}], "packageName": "golang.org/x/net/dns/dnsmessage", "collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "programRoutines": [{"name": "unpackSVCBResource"}, {"name": "Message.Unpack"}, {"name": "Parser.Additional"}, {"name": "Parser.AllAdditionals"}, {"name": "Parser.AllAnswers"}, {"name": "Parser.AllAuthorities"}, {"name": "Parser.Answer"}, {"name": "Parser.Authority"}, {"name": "Parser.HTTPSResource"}, {"name": "Parser.SVCBResource"}]}]}], "published": "2026-07-21T20:17:01.213", "references": [{"url": "https://go.dev/cl/786345", "source": "security@golang.org"}, {"url": "https://go.dev/issue/79795", "source": "security@golang.org"}, {"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI", "source": "security@golang.org"}, {"url": "https://pkg.go.dev/vuln/GO-2026-5942", "source": "security@golang.org"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer."}], "lastModified": "2026-08-14T16:16:55.673", "sourceIdentifier": "security@golang.org"}