DEBIAN-CVE-2026-12969
An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c. When parsing NS section records, extract_name() is called with extrabytes=0, failing to validate that 10 additional bytes exist for fixed-length DNS record fields. A remote attacker controlling a DNS zone can exploit this via a crafted NXDOMAIN response to cause a 10-byte heap out-of-bounds read, potentially accessing stale data from prior transactions.
DEBIAN-CVE-2026-12969
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-12969
dnsmasq
Source reference: /affected/0/package/name
- Affected versions
- 2.89-1
Source reference:
/affected/0/versions2.90-1Source reference:
/affected/0/versions2.90-2Source reference:
/affected/0/versions2.90-3Source reference:
/affected/0/versions2.90-4Source reference:
/affected/0/versions2.90-4~deb12u1Source reference:
/affected/0/versions2.90-4~deb12u2Source reference:
/affected/0/versions2.90-5Source reference:
/affected/0/versions2.90-6Source reference:
/affected/0/versions2.90-7Source reference:
/affected/0/versions2.91-1Source reference:
/affected/0/versions2.91~test6-1Source reference:
/affected/0/versions2.91~test9-1Source reference:
/affected/0/versions2.92-1Source reference:
/affected/0/versions2.92-1+exp1Source reference:
/affected/0/versions2.92-1~exp1Source reference:
/affected/0/versions2.92-2Source reference:
/affected/0/versions2.92-3Source reference:
/affected/0/versions2.92-4Source reference:
/affected/0/versions2.92-5Source reference:
/affected/0/versions2.92~rc1-1Source reference:
/affected/0/versions2.92~rc3-1Source reference:
/affected/0/versions2.93-1Source reference:
/affected/0/versions2.93-2Source reference:
/affected/0/versions2.93-3Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
dnsmasq
Source reference: /affected/1/package/name
- Affected versions
- 2.91-1
Source reference:
/affected/1/versions2.91-1+deb13u1Source reference:
/affected/1/versions - Fixed versions
- 2.91-1+deb13u2
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
dnsmasq
Source reference: /affected/2/package/name
- Affected versions
- 2.91-1
Source reference:
/affected/2/versions2.92-1Source reference:
/affected/2/versions2.92-1+exp1Source reference:
/affected/2/versions2.92-1~exp1Source reference:
/affected/2/versions2.92-2Source reference:
/affected/2/versions2.92-3Source reference:
/affected/2/versions2.92-4Source reference:
/affected/2/versions2.92-5Source reference:
/affected/2/versions2.92~rc1-1Source reference:
/affected/2/versions2.92~rc3-1Source reference:
/affected/2/versions - Fixed versions
- 2.93-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsmasq",
"purl": "pkg:deb/debian/dnsmasq?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.89-1",
"2.90-1",
"2.90-2",
"2.90-3",
"2.90-4",
"2.90-4~deb12u1",
"2.90-4~deb12u2",
"2.90-5",
"2.90-6",
"2.90-7",
"2.91-1",
"2.91~test6-1",
"2.91~test9-1",
"2.92-1",
"2.92-1+exp1",
"2.92-1~exp1",
"2.92-2",
"2.92-3",
"2.92-4",
"2.92-5",
"2.92~rc1-1",
"2.92~rc3-1",
"2.93-1",
"2.93-2",
"2.93-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12969.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.91-1+deb13u2"
}
]
}
],
"package": {
"name": "dnsmasq",
"purl": "pkg:deb/debian/dnsmasq?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.91-1",
"2.91-1+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12969.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.93-1"
}
]
}
],
"package": {
"name": "dnsmasq",
"purl": "pkg:deb/debian/dnsmasq?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.91-1",
"2.92-1",
"2.92-1+exp1",
"2.92-1~exp1",
"2.92-2",
"2.92-3",
"2.92-4",
"2.92-5",
"2.92~rc1-1",
"2.92~rc3-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12969.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55522 · Revision 1
- Added to Heist Feed
- Publisher date