What’s Vulnerable › Vulnerabilities
CVE-2026-24030: Unbounded memory allocation for DoQ and DoH3
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-31 · updated 2026-07-25
- Weakness: CWE-789
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 products
- PowerDNS DNSdist: from 1.9.0 before 1.9.12; from 2.0.0 before 2.0.3 — fixed in 1.9.12, 2.0.3
How to fix
Upgrade to a fixed version: PowerDNS DNSdist 1.9.12, 2.0.3. Check the vendor advisory for mitigations.
References
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