Home

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.

PUBLISHED Reserved 2026-02-24 | Published 2026-03-31 | Updated 2026-04-02 | Assigner OX




MEDIUM: 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Problem types

Use After Free

Product status

Default status
unaffected

1.9.0 (semver) before 1.9.12
affected

2.0.0 (semver) before 2.0.3
affected

Credits

Naoki Wakamatsu finder

References

www.dnsdist.org/...owerdns-advisory-for-dnsdist-2026-02.html

cve.org (CVE-2026-27854)

nvd.nist.gov (CVE-2026-27854)

Download JSON