CVE-2026-46600 (GCVE-0-2026-46600)
Vulnerability from cvelistv5 – Published: 2026-07-21 19:18 – Updated: 2026-08-14 15:46
VLAI
EPSS
VEX
Title
Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage
Summary
Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-23 15:00 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Go standard library | net |
Affected:
1.26.0-0 , < 1.26.6
(semver)
Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver) |
guessed | |
| golang.org/x/net | golang.org/x/net/dns/dnsmessage |
Affected:
0 , < 0.56.0
(semver)
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-46600",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-23T15:00:27.171241Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-23T15:00:35.473Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "net",
"product": "net",
"programRoutines": [
{
"name": "cgoResSearch"
},
{
"name": "LookupCNAME"
},
{
"name": "Resolver.LookupCNAME"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.26.6",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
},
{
"lessThan": "1.27.0-rc.3",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/net/dns/dnsmessage",
"product": "golang.org/x/net/dns/dnsmessage",
"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"
}
],
"vendor": "golang.org/x/net",
"versions": [
{
"lessThan": "0.56.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Mundur (https://github.com/M0nd0R)"
}
],
"descriptions": [
{
"lang": "en",
"value": "Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-125: Out-of-bounds Read",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-14T15:46:12.894Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/cl/786345"
},
{
"url": "https://go.dev/issue/79795"
},
{
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5942"
}
],
"title": "Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-46600",
"datePublished": "2026-07-21T19:18:59.755Z",
"dateReserved": "2026-05-15T17:35:00.814Z",
"dateUpdated": "2026-08-14T15:46:12.894Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-46600",
"date": "2026-09-16",
"epss": "0.00549",
"percentile": "0.44593"
},
"microsoft_vex": {
"current_release_date": "2026-08-23T14:57:59.000Z",
"cve": "CVE-2026-46600",
"id": "msrc_CVE-2026-46600",
"initial_release_date": "2026-07-25T01:05:22.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "3",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46600.json",
"version": "3"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-46600\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-07-21T20:17:01.213\",\"lastModified\":\"2026-08-14T16:16:55.673\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"vendor\":\"Go standard library\",\"product\":\"net\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"net\",\"programRoutines\":[{\"name\":\"cgoResSearch\"},{\"name\":\"LookupCNAME\"},{\"name\":\"Resolver.LookupCNAME\"}],\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"golang.org/x/net\",\"product\":\"golang.org/x/net/dns/dnsmessage\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"golang.org/x/net/dns/dnsmessage\",\"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\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"0.56.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-23T15:00:27.171241Z\",\"id\":\"CVE-2026-46600\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"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\"}]}}",
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-09T19:52:27+00:00",
"cve": "CVE-2026-46600",
"id": "CVE-2026-46600",
"initial_release_date": "2026-07-21T19:18:59.755000+00:00",
"product_status:fixed": "80",
"product_status:known_affected": "60",
"product_status:known_not_affected": "1121",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "golang.org/x/net/dns/dnsmessage: golang.org/x/net/dns/dnsmessage: Denial of Service via invalid DNS record parsing",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46600.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-15T02:04:18Z",
"cve": "CVE-2026-46600",
"id": "CVE-2026-46600",
"initial_release_date": "2026-07-24T02:21:48Z",
"product_status:known_affected": "274",
"product_status:known_not_affected": "362",
"product_status:recommended": "45",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46600",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46600.json",
"version": "11"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"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\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-46600\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-23T15:00:27.171241Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-23T15:00:16.150Z\"}}], \"cna\": {\"title\": \"Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage\", \"credits\": [{\"lang\": \"en\", \"value\": \"Mundur (https://github.com/M0nd0R)\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"net\", \"versions\": [{\"status\": \"affected\", \"version\": \"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\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/786345\"}, {\"url\": \"https://go.dev/issue/79795\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/94pEornpRlI\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5942\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-125: Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-08-13T21:58:52.611Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-46600\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-13T21:58:52.611Z\", \"dateReserved\": \"2026-05-15T17:35:00.814Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-07-21T19:18:59.755Z\", \"assignerShortName\": \"Go\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…