UBUNTU-CVE-2026-5947
- Source
- https://ubuntu.com/security/CVE-2026-5947
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5947.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5947
- Upstream
- Downstream
- Related
- Published
- 2026-05-20T00:00:00Z
- Modified
- 2026-06-30T18:18:01Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Ubuntu - medium
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Ubuntu:25.10 / bind9
Package
- Name
- bind9
- Purl
- pkg:deb/ubuntu/bind9?arch=source&distro=questing
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed1:9.20.11-1ubuntu2.4
Affected versions
1:9.*
1:9.20.4-3ubuntu1
1:9.20.4-3ubuntu2
1:9.20.4-3ubuntu3
1:9.20.9-2ubuntu1
1:9.20.10-1ubuntu1
1:9.20.11-1ubuntu1
1:9.20.11-1ubuntu2
1:9.20.11-1ubuntu2.1
1:9.20.11-1ubuntu2.2
Ecosystem specific
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bind9",
"binary_version": "1:9.20.11-1ubuntu2.4"
},
{
"binary_name": "bind9-dnsutils",
"binary_version": "1:9.20.11-1ubuntu2.4"
},
{
"binary_name": "bind9-host",
"binary_version": "1:9.20.11-1ubuntu2.4"
},
{
"binary_name": "bind9-libs",
"binary_version": "1:9.20.11-1ubuntu2.4"
},
{
"binary_name": "bind9-utils",
"binary_version": "1:9.20.11-1ubuntu2.4"
}
]
}
Ubuntu:26.04:LTS / bind9
Package
- Name
- bind9
- Purl
- pkg:deb/ubuntu/bind9?arch=source&distro=resolute
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed1:9.20.18-1ubuntu2.1
Ecosystem specific
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "bind9",
"binary_version": "1:9.20.18-1ubuntu2.1"
},
{
"binary_name": "bind9-dnsutils",
"binary_version": "1:9.20.18-1ubuntu2.1"
},
{
"binary_name": "bind9-host",
"binary_version": "1:9.20.18-1ubuntu2.1"
},
{
"binary_name": "bind9-libs",
"binary_version": "1:9.20.18-1ubuntu2.1"
},
{
"binary_name": "bind9-utils",
"binary_version": "1:9.20.18-1ubuntu2.1"
}
]
}