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Vulnerability from bitnami_vulndb
Published
2026-05-11 05:44
Modified
2026-05-11 06:12
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.
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"id": "BIT-golang-2026-33811",
"modified": "2026-05-11T06:12:18.508Z",
"published": "2026-05-11T05:44:24.861Z",
"references": [
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"type": "WEB",
"url": "https://go.dev/cl/767860"
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{
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"url": "https://go.dev/issue/78803"
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{
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}
],
"schema_version": "1.6.2",
"summary": "Crash when handling long CNAME response in net"
}
CVE-2026-33811 (GCVE-0-2026-33811)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-07-01 12:05
VLAI
EPSS
Title
Crash when handling long CNAME response in net
Summary
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
14 references
| URL | Tags |
|---|---|
| https://go.dev/issue/78803 | |
| https://go.dev/cl/767860 | |
| https://groups.google.com/g/golang-announce/c/qcC… | |
| https://pkg.go.dev/vuln/GO-2026-4981 | |
| https://access.redhat.com/security/cve/CVE-2026-33811 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2467822 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:33574 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:23262 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:23264 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33120 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33123 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33142 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33150 | vendor-advisoryx_refsource_REDHAT |
Impacted products
83 products
Credits
hamayanhamayan
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"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:33574"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:23262"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:23264"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:33120"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:33123"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:33142"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:33150"
}
],
"solutions": [
{
"lang": "en",
"value": "RHSA-2026:33574: Red Hat Developer Hub 1.9"
},
{
"lang": "en",
"value": "RHSA-2026:23262: Red Hat Hardened Images"
},
{
"lang": "en",
"value": "RHSA-2026:23264: Red Hat Hardened Images"
},
{
"lang": "en",
"value": "RHSA-2026:33120: Red Hat OpenShift Service Mesh 3.0"
},
{
"lang": "en",
"value": "RHSA-2026:33123: Red Hat OpenShift Service Mesh 3.1"
},
{
"lang": "en",
"value": "RHSA-2026:33142: Red Hat OpenShift Service Mesh 3.2"
},
{
"lang": "en",
"value": "RHSA-2026:33150: Red Hat OpenShift Service Mesh 3.3"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-05-07T20:01:34.913Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-05-07T19:41:19.285Z",
"value": "Made public."
}
],
"title": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME",
"workarounds": [
{
"lang": "en",
"value": "To mitigate this issue, applications can be configured to use the pure Go DNS resolver instead of the `cgo` DNS resolver. This can be achieved by setting the `GODEBUG` environment variable to `netdns=go`. For example, to run a Go application with this mitigation: `GODEBUG=netdns=go /path/to/your/go/application`. This change may require restarting affected applications or services to take effect. Users should verify that this change does not negatively impact DNS resolution for their specific application environment."
}
],
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
}
],
"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": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "hamayanhamayan"
}
],
"descriptions": [
{
"lang": "en",
"value": "When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-415: Double Free",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:19.285Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/78803"
},
{
"url": "https://go.dev/cl/767860"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4981"
}
],
"title": "Crash when handling long CNAME response in net"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-33811",
"datePublished": "2026-05-07T19:41:19.285Z",
"dateReserved": "2026-03-23T20:35:32.814Z",
"dateUpdated": "2026-07-01T12:05:11.545Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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.
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