PT-2026-29245 · Dnsdist · Dnsdist
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
DNSdist (affected versions not specified)
Description
An attacker can cause a denial of service by tricking the system into allocating excessive memory while processing DNS over QUIC or DNS over HTTP/3 payloads. In environments with significant available memory, this typically triggers an exception that closes the QUIC connection. However, in other scenarios, the system may enter an out-of-memory (OOM) state—a condition where the system lacks enough RAM to operate—resulting in the termination of the process and disruption of DNS resolution. This issue can be triggered by a single crafted QUIC packet and requires no authentication.
Recommendations
As a temporary mitigation, disable DNS over QUIC (DoQ) or DNS over HTTP/3 (DoH3).
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
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Weakness Enumeration
Related Identifiers
Affected Products
Dnsdist