CVE-2026-27853 Details
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.
A vulnerability allowing an out-of-bounds write has been identified in PowerDNS DNSdist versions 1.9.0 prior to 1.9.11 and 2.0.0 prior to 2.0.2. This vulnerability can be exploited by sending crafted DNS responses that manipulate the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. The exploitation may cause the modified packet to exceed the maximum DNS packet size, leading to a crash and a denial-of-service condition.
Users can upgrade to PowerDNS DNSdist versions 1.9.12 or 2.0.3, where this vulnerability has been patched. Alternatively, the vulnerable methods can be avoided in custom Lua code.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| powerdns dnsdist | >= 1.9.0, < 1.9.12 >= 2.0.0, < 2.0.3 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 25, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 14, 2026 | Initial Analysis | [email protected] |
| Mar 31, 2026 | CVE Modified | CISA-ADP |
| Mar 31, 2026 | New CVE Received | [email protected] |