CVE-2026-27854 Details
Description
An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.
A use-after-free vulnerability has been identified in PowerDNS DNSdist versions 1.9.0 prior to 1.9.11 and 2.0.0 prior to 2.0.2. The issue arises when the DNSQuestion:getEDNSOptions method is used in custom Lua code, allowing an attacker to send crafted DNS queries that could refer to a modified version of the DNS packet. This manipulation can trigger a use-after-free condition, potentially leading to a crash and causing a denial-of-service situation.
Users can upgrade to PowerDNS DNSdist versions 1.9.12 or 2.0.3, where this vulnerability has been patched. Alternatively, the DNSQuestion:getEDNSOptions method 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-416 | Use After Free | 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] |