CVE-2026-27853
Out-of-bounds write when rewriting large DNS packets
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | powerdns |
| Product | dnsdist |
| Published | Mar 31, 2026 |
| Last Updated | Mar 31, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
PowerDNS / DNSdist
1.9.0 < 1.9.12 2.0.0 < 2.0.3
References
Credits
ilya rozentsvaig