What is CVE-2026-27853?

CVE-2026-27853 is a medium-severity vulnerability in Powerdns Dnsdist. CVSS score: 5.9/10. Published 2026-03-31.

How severe is CVE-2026-27853?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Powerdns Dnsdist

CVE-2026-27853

An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might becom…

EPSS: 0.000 (1.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

References

www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html

Frequently asked questions

What is CVE-2026-27853?: CVE-2026-27853 is a medium-severity vulnerability in Powerdns Dnsdist. CVSS score: 5.9/10. Published 2026-03-31.
How severe is CVE-2026-27853?: Medium severity. CVSS v3 base score is 5.9 out of 10.