CVE-2026-40208: low-severity vulnerability in PowerDNS DNSdist
Denial of service via DoH3 queries
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.7epss 0.4%
An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
PowerDNS · DNSdistRelated CVEs — PowerDNS DNSdist
In the same product, most dangerous first.
CVE-2025-30194HIGHDenial of service via crafted DoH exchangeEPSS 2.3%CVE-2024-25581HIGHTransfer requests received over DoH can lead to a denial of service in DNSdistEPSS 1.1%CVE-2026-33598MEDIUMOut-of-bounds read in cache inspection via LuaEPSS 1.1%CVE-2026-24028MEDIUMOut-of-bounds read when parsing DNS packets via LuaEPSS 1.1%CVE-2026-40210MEDIUMOut-of-bounds read in SetMacAddrActionEPSS 0.7%CVE-2026-33602MEDIUMOff-by-one access when processing crafted UDP responsesEPSS 0.7%