Vulnerability · Published May 21, 2026 · Assigned by OX
CVE-2026-42002Concurrency and locking defects in GSS-TSIG
Medium 5.9
In plain English
A medium-severity security flaw in Authoritative from PowerDNS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.3%top 81.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Concurrency and locking defects in GSS-TSIG
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | pdns | 5.0.5-r0 | ALPINE-CVE-2026-42002 |
| Alpine:v3.24 | pdns | 5.0.5-r0 | ALPINE-CVE-2026-42002 |
| Debian:12 | pdns | no fix listed | DEBIAN-CVE-2026-42002 |
| Debian:13 | pdns | 4.9.15-0+deb13u1 | DEBIAN-CVE-2026-42002 |
| Debian:14 | pdns | 5.0.5-1 | DEBIAN-CVE-2026-42002 |
| Ubuntu:24.04:LTS | pdns | no fix listed | UBUNTU-CVE-2026-42002 |
| Ubuntu:25.10 | pdns | no fix listed | UBUNTU-CVE-2026-42002 |
| Ubuntu:26.04:LTS | pdns | no fix listed | UBUNTU-CVE-2026-42002 |
| Ubuntu:26.10 | pdns | no fix listed | UBUNTU-CVE-2026-42002 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| PowerDNS | Authoritative | 4.9.0 – before 4.9.155.0.0 – before 5.0.5 |
Weakness: CWE-364 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H