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dnsdist

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.

CVE-2026-27853 is an out-of-bounds write vulnerability identified in PowerDNS DNSdist versions 1.9.0 and 2.0.0. The issue arises when an attacker sends specially crafted DNS responses that interact with the DNSQuestion:changeName or DNSResponse:changeName methods within custom Lua scripts configured in DNSdist. These methods allow modification of DNS packet names, but improper handling can cause the rewritten DNS packet to grow beyond the original size and potentially exceed the DNS protocol maximum packet size of 65535 bytes. This overflow can lead to memory corruption, resulting in a crash of the DNSdist service and causing a denial of service (DoS) condition. The vulnerability does not allow for code execution or data leakage but impacts service availability. Exploitation requires the attacker to send malicious DNS responses to a DNSdist instance that is running vulnerable versions and has Lua scripting enabled with these specific methods in use. The attack vector is network-based with no authentication or user interaction required, but the complexity is elevated due to the need to craft precise DNS responses and Lua code conditions. No public exploits have been reported yet, but the vulnerability is publicly disclosed with a CVSS v3.1 score of 5.9, reflecting medium severity. The vulnerability highlights the risks of dynamic DNS packet manipulation via Lua scripting without adequate bounds checking.

Detailed information about CVE-2026-27853: Out-of-bounds Write in PowerDNS DNSdist affecting PowerDNS DNSdist. Get real-time updates, technical details, and mit

CVE-2026-27853: Out-of-bounds Write in PowerDNS DNSdist - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-27853: Out-of-bounds Write in PowerDNS DNSdist

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