dnsdist: An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuesti...
CVE-2026-27854 is fixed in dnsdist on 1 platform, first by DEBIAN-CVE-2026-27854, released March 31, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dnsdist · Debian 13.5 (trixie) | 1.9.14-0+deb13u1 | DEBIAN-CVE-2026-27854 | Mar 31, 2026 |
| dnsdist · Debian 14 | 2.0.3-1 | DEBIAN-CVE-2026-27854 | Mar 31, 2026 |
| dnsdist · opensuse-leap 16.0 | 1.9.13-160000.1.1 | OPENSUSE-SU-2026:21015-1 | Jun 22, 2026 |
| dnsdist · sles 15.7 | 1.9.12-150700.3.9.1 | SUSE-SU-2026:1618-1 | Apr 24, 2026 |
| dnsdist · sles 16.0 | 1.9.13-160000.1.1 | SUSE-SU-2026:22319-1 | Jun 22, 2026 |
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