CVE-2026-27854
Use after free when parsing EDNS options in Lua
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
1th
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.
| Vendor | powerdns |
| Product | dnsdist |
| Published | Mar 31, 2026 |
| Last Updated | Apr 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low
Affected Versions
PowerDNS / DNSdist
1.9.0 < 1.9.12 2.0.0 < 2.0.3
References
Credits
Naoki Wakamatsu