EUVD-2026-17407
GHSA-w68q-j3pw-29rg
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Description
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.
Analysis
DNSdist fails to validate packet size bounds when rewriting DNS questions or responses via Lua methods (DNSQuestion:changeName, DNSResponse:changeName), allowing unauthenticated remote attackers to craft DNS responses that trigger out-of-bounds writes and exceed the 65535-byte DNS packet size limit, resulting in denial of service via crash. CVSS 5.9 (high availability impact); no public exploit code identified at time of analysis.
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Priority Score
Vendor Status
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | fixed | (unfixed) | end-of-life |
| bookworm | fixed | (unfixed) | end-of-life |
| trixie | vulnerable | 1.9.10-1+deb13u1 | - |
| forky | vulnerable | 2.0.2-1 | - |
| sid | fixed | 2.0.3-1 | - |
| (unstable) | fixed | 2.0.3-1 | - |
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External POC / Exploit Code
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