CVE-2026-27854

Use after free when parsing EDNS options in Lua

Medium · published March 31, 2026

CVSS v3.1
4.8
EPSS
1%
Percentile
71.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.01338 · 71.0th percentile
Published
2026-03-31T12:06Z
EPSS history
Timeline
  • 31 MAR 12:06Z
    Use after free when parsing EDNS options in Lua
    cvelistv5