What is CVE-2026-0396?

CVE-2026-0396 is a low-severity vulnerability in Powerdns Dnsdist, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 3.1/10. Published 2026-03-31.

How severe is CVE-2026-0396?

Low severity. CVSS v3 base score is 3.1 out of 10.

XSS in Powerdns Dnsdist

CVE-2026-0396

An attacker might be able to inject HTML content into the internal web dashboard by sending crafted DNS queries to a DNSdist instance where domain-based dynamic rules have been enabled via either DynBlockRulesGroup:setSuffixMatchRule or DynBlockRulesGroup:setSuffixMatchRuleFFI.

EPSS: 0.001 (3.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

security@open-xchange.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-0396?: CVE-2026-0396 is a low-severity vulnerability in Powerdns Dnsdist, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 3.1/10. Published 2026-03-31.
How severe is CVE-2026-0396?: Low severity. CVSS v3 base score is 3.1 out of 10.