Description
An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might become larger than the initial response and even exceed 65535 bytes, potentially leading to a crash resulting in denial of service.
Problem types
Out-of-bounds Write
Product status
1.9.0 (semver) before 1.9.12
2.0.0 (semver) before 2.0.3
Credits
ilya rozentsvaig
References
www.dnsdist.org/...owerdns-advisory-for-dnsdist-2026-02.html