Vulnerability · Published Apr 26, 2026 · Assigned by mitre
CVE-2026-42254
Medium 4.0
In plain English
A medium-severity security flaw in Hickory DNS from Hickory Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.2%top 94.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Hickory DNS hickory-recursor 0.1 through 0.25.2 allows cross-zone poisoning because cached data is not directly associated with a query that triggered a response.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | rust-hickory-recursor | no fix listed | DEBIAN-CVE-2026-42254 |
| Debian:14 | rust-hickory-recursor | no fix listed | DEBIAN-CVE-2026-42254 |
| Ubuntu:25.10 | rust-hickory-recursor | no fix listed | UBUNTU-CVE-2026-42254 |
| Ubuntu:26.04:LTS | rust-hickory-recursor | no fix listed | UBUNTU-CVE-2026-42254 |
| Ubuntu:26.10 | rust-hickory-recursor | no fix listed | UBUNTU-CVE-2026-42254 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Hickory Project | Hickory DNS | 0.1 – before 0.26 |
Weakness: CWE-706 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N