Vulnerability · Published Mar 31, 2026 · Assigned by OX
CVE-2026-24030Unbounded memory allocation for DoQ and DoH3
Medium 5.3
In plain English
A medium-severity security flaw in DNSdist from PowerDNS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An attacker might be able to trick DNSdist into allocating too much memory while processing DNS over QUIC or DNS over HTTP/3 payloads, resulting in a denial of service. In setups with a large quantity of memory available this usually results in an exception and the QUIC connection is properly closed, but in some cases the system might enter an out-of-memory state instead and terminate the process.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | dnsdist | 2.0.4-r0 | ALPINE-CVE-2026-24030 |
| Alpine:v3.24 | dnsdist | 2.0.4-r0 | ALPINE-CVE-2026-24030 |
| Debian:12 | dnsdist | no fix listed | DEBIAN-CVE-2026-24030 |
| Debian:13 | dnsdist | 1.9.14-0+deb13u1 | DEBIAN-CVE-2026-24030 |
| Debian:14 | dnsdist | 2.0.3-1 | DEBIAN-CVE-2026-24030 |
| Ubuntu:25.10 | dnsdist | no fix listed | UBUNTU-CVE-2026-24030 |
| Ubuntu:26.04:LTS | dnsdist | no fix listed | UBUNTU-CVE-2026-24030 |
| Ubuntu:26.10 | dnsdist | no fix listed | UBUNTU-CVE-2026-24030 |
Affected products (as reported)
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L