CVE-2026-27853
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductPowerdns Dnsdist
PublishedMar 31, 2026
First seenMar 31, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- powerdns dnsdist1.9.12, 2.0.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| powerdns dnsdist | 1.9.0 ≤ v < 1.9.12, 2.0.0 ≤ v < 2.0.3 | 1.9.12, 2.0.3 |
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