Out-of-bounds read in dnsdist - CVE-2026-24028
Published: April 23, 2026
Vulnerability identifier: #VU126956
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-2026-24028
CWE-ID: CWE-125
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 an out-of-bounds read in DNS packet parsing via newDNSPacketOverlay in custom Lua code when parsing crafted DNS response packets. A remote attacker can send a crafted DNS response packet to cause a denial of service.
The issue occurs when custom Lua code uses newDNSPacketOverlay to parse DNS packets, and the out-of-bounds read might also access unrelated memory.
How to mitigate CVE-2026-24028
Install security update from vendor's website.