HighFix available
bind — security advisory
A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.
- Products
- bind
- Affected versions
- Not specified
- Fixed versions
- 9.18.19-r0
- CVEs
- CVE-2023-4236
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 15:00 UTC · Revision 1
Source evidence
A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.
osv:ALPINE-CVE-2023-4236
bind
Fixed versions: 9.18.19-r0
bind
Fixed versions: 9.18.19-r0
bind
Fixed versions: 9.18.19-r0
bind
Fixed versions: 9.18.19-r0
bind
Fixed versions: 9.18.19-r0
bind
Fixed versions: 9.18.19-r0
bind
Fixed versions: 9.18.19-r0
bind
Fixed versions: 9.18.19-r0
Complete source record
{
"id": "9ad899ab23eb23745bd4774026c0524d174e4c8fc1cf1bb6a95899a98e382f68",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2023-4236",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2023-4236",
"summary": "A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.",
"evidence": "osv:ALPINE-CVE-2023-4236",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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"evidence": "/affected/0/ranges"
}
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2023-4236",
"aliases": [
"ALPINE-CVE-2023-4236"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
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{
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],
"package": {
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"purl": "pkg:apk/alpine/bind?arch=source",
"ecosystem": "Alpine:v3.17"
},
"database_specific": {
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{
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"package": {
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"ecosystem": "Alpine:v3.18"
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"database_specific": {
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"package": {
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"package": {
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"package": {
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"ecosystem": "Alpine:v3.21"
},
"database_specific": {
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},
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{
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"package": {
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"ecosystem": "Alpine:v3.22"
},
"database_specific": {
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{
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],
"package": {
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"ecosystem": "Alpine:v3.23"
},
"database_specific": {
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{
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],
"package": {
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"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2023-4236.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-26T17:17:58.639664673Z",
"provider": "osv",
"upstream": [
"CVE-2023-4236"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2023-4236"
]
},
"related_cves": [
{
"value": "CVE-2023-4236",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 454492,
"published_at": "2023-09-20T13:15:12.313+00:00"
}