ALPINE-CVE-2026-5947
Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation may attempt to read the now-discarded DNS message. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.
ALPINE-CVE-2026-5947
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:ALPINE-CVE-2026-5947
bind
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 9.18.49-r0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
bind
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 9.18.49-r0
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
bind
Source reference: /affected/2/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 9.20.23-r0
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
bind
Source reference: /affected/3/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 9.20.23-r0
Source reference:
/affected/3/ranges - Prerequisites
- Not stated in this record
bind
Source reference: /affected/4/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 9.20.23-r0
Source reference:
/affected/4/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": "9.20.0"
},
{
"fixed": "9.18.49-r0"
}
]
}
],
"package": {
"name": "bind",
"purl": "pkg:apk/alpine/bind?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-5947.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "9.20.0"
},
{
"fixed": "9.18.49-r0"
}
]
}
],
"package": {
"name": "bind",
"purl": "pkg:apk/alpine/bind?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-5947.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "9.20.0"
},
{
"fixed": "9.20.23-r0"
}
]
}
],
"package": {
"name": "bind",
"purl": "pkg:apk/alpine/bind?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-5947.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "9.20.0"
},
{
"fixed": "9.20.23-r0"
}
]
}
],
"package": {
"name": "bind",
"purl": "pkg:apk/alpine/bind?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-5947.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "9.20.0"
},
{
"fixed": "9.20.23-r0"
}
]
}
],
"package": {
"name": "bind",
"purl": "pkg:apk/alpine/bind?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-5947.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54580 · Revision 1
- Added to Heist Feed
- Publisher date