Disclosure summary
Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.
Source-reported weakness categories
CWE-755, CWE-908
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2019-16866
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| nlnetlabs | unbound | * {"versionEndExcluding":"1.9.4"} |
| canonical | ubuntu_linux | 19.04 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Product, Release Notes
- lists.fedoraproject.org
- lists.fedoraproject.org
- nlnetlabs.nl — Patch, Vendor Advisory
- seclists.org
- usn.ubuntu.com — Third Party Advisory
- www.debian.org
- github.com — Product, Release Notes
- lists.fedoraproject.org
- lists.fedoraproject.org
- nlnetlabs.nl — Patch, Vendor Advisory
- seclists.org
- usn.ubuntu.com — Third Party Advisory
- www.debian.org
PUBLISHED 2019-10-03T15:15:09-04:00
MODIFIED 2026-10-08T17:17:16-04:00
INGESTED 2026-10-10T20:50:18-04:00