CVSS 4.0
8.2 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NCVE-2026-123602
High (8.2) in hickory-dns hickory-dns. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.
On this page
The Hickory DNS recursor in all versions of hickory-recursor and in hickory-resolver 0.26.0-beta.1 before 0.26.2 (recursor feature) is vulnerable to ghost domain names attacks because it reuses child-side apex NS RRsets cached from zone NS queries for iterative resolution. By repeatedly querying a zone's NS records, an attacker keeps the stale RRset cached indefinitely, letting name servers whose delegation the parent revoked keep answering for the zone.
Severity
CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N- EPSS
- 0.3% estimated probability of exploitation activity in the next 30 days; 20th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-09. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-672 Operation on a Resource after Expiration or Release
- Published
- Modified
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| hickory-dns | through 0.26.0-alpha.1 |
| hickory-dns | from 0.26.0-beta.1 before 0.26.2 |
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 13 | rust-hickory-recursor, rust-hickory-resolver | no fix listed | DEBIAN-CVE-2026-123602 |
| Debian | 14 | rust-hickory-recursor | no fix listed | DEBIAN-CVE-2026-123602 |
| Debian | 14 | rust-hickory-resolver | 0.26.3-1 | DEBIAN-CVE-2026-123602 |
| Ubuntu | 24.04:LTS | rust-hickory-resolver | no fix listed | UBUNTU-CVE-2026-123602 |
| Ubuntu | 26.04:LTS, 26.10 | rust-hickory-recursor, rust-hickory-resolver | no fix listed | UBUNTU-CVE-2026-123602 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu.