CVE-2026-27853
Out-of-bounds write when rewriting large DNS packets
- State
- Published
- Severity
- 5.9 Medium
- Published
- Mar 31, 2026
- Updated
- Mar 31, 2026
- Reserved
- Feb 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | OX |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
DNSdistPowerDNS |
|
References
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