High
Security advisory
A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-4892
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 22:31 UTC · Revision 1
Source evidence
A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.
osv:CVE-2026-4892
Complete source record
{
"id": "63d5321bf25bf53d71cab2f6c512b6b2a880d8f1b4ea725fa6799bd598107e56",
"url": "https://osv.dev/vulnerability/CVE-2026-4892",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-4892",
"summary": "A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.",
"evidence": "osv:CVE-2026-4892",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-4892",
"aliases": [
"CVE-2026-4892"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/pi-hole/ftl",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "82c58cc45435ddd77875daf368cf64398bc15966"
}
],
"database_specific": {
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{
"range": [
{
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}
],
"source": "REFERENCES_TAG",
"original_tag": "v6.6.2"
}
]
}
}
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"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4892.json"
}
}
],
"modified": "2026-10-28T02:30:23.851548270Z",
"provider": "osv",
"references": [
"https://github.com/pi-hole/FTL/releases/tag/v6.6.2",
"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html",
"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4892.json",
"https://thekelleys.org.uk/dnsmasq/CVE/",
"https://www.kb.cert.org/vuls/id/471747",
"https://access.redhat.com/errata/RHSA-2026:19158",
"https://access.redhat.com/errata/RHSA-2026:19373",
"https://access.redhat.com/errata/RHSA-2026:20589",
"https://access.redhat.com/errata/RHSA-2026:34508",
"https://access.redhat.com/errata/RHSA-2026:40762",
"https://access.redhat.com/security/cve/CVE-2026-4892",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4892.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-4892",
"https://bugzilla.redhat.com/show_bug.cgi?id=2458518",
"https://github.com/NixOS/nixpkgs/pull/519082",
"https://github.com/NixOS/nixpkgs/pull/519093"
],
"provider_metadata": {
"cna_assigner": "certcc",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "2.92rel2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4892.json"
}
},
"related_cves": [
{
"value": "CVE-2026-4892",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490542,
"published_at": "2026-05-11T16:47:58.846+00:00"
}