Uncontrolled Memory Allocation in dnsdist - CVE-2026-24030
Published: April 23, 2026
Vulnerability identifier: #VU126958
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-24030
CWE-ID: CWE-789
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: PowerDNS.COM B.V.
Affected software:
dnsdist
dnsdist
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in DNS over QUIC and DNS over HTTP/3 payload processing when handling DoQ or DoH3 queries. A remote attacker can send DoQ or DoH3 queries to cause a denial of service.
In some environments the condition results in an exception and connection closure, but in others it might lead to an out-of-memory state and process termination.
How to mitigate CVE-2026-24030
Install security update from vendor's website.