CVE-2026-0396 HTML injection in the web dashboard
Low 3.1
Published
Updated
Check this codebase for CVE-2026-0396 and fix it if it is affected.
What it is: CVE-2026-0396 is a low-severity vulnerability in PowerDNS DNSdist, published on 31 Mar 2026.
Exploitation: There is no known exploitation of CVE-2026-0396 in the wild and no public exploit code.
Affected product: PowerDNS DNSdist. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-0396/ (Markdown: https://insights.sbomify.com/CVE-2026-0396/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-0396?
CVE-2026-0396 is a low-severity vulnerability in PowerDNS DNSdist, published on 31 Mar 2026.
Official description
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.
Weakness: CWE-80
Which versions are affected by CVE-2026-0396?
It affects 1 product.
Products include Powerdns Dnsdist.
How do I fix CVE-2026-0396?
Upgrade to a fixed version.
Is CVE-2026-0396 being exploited?
There is no known exploitation of CVE-2026-0396 in the wild and no public exploit code.
Other vulnerabilities in PowerDNS DNSdist
Sources
Also known as DEBIAN-CVE-2026-0396, GHSA-c6vq-q4cf-9cgj, UBUNTU-CVE-2026-0396.