CVE-2026-0543 Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation
Authenticated attackers can cause complete service unavailability in Kibana by exploiting improper input validation in the Email Connector.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-0543?
CVE-2026-0543 is a medium-severity denial of service vulnerability in Elastic Kibana, published on 13 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper Input Validation (CWE-20) in Kibana's Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.
Which versions are affected by CVE-2026-0543?
2 open source packages ship an affected version, including kibana and elk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
kibana Bitnami | All versions | 8.19.10, 9.1.10, 9.2.4 |
elk Bitnami | All versions | 8.19.10, 9.1.10, 9.2.4 |
Products include Elastic Kibana.
How do I fix CVE-2026-0543?
Upgrade kibana to a fixed version for your release line: 8.19.10, 9.1.10 or 9.2.4.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-0543 being exploited?
There is no known exploitation of CVE-2026-0543 in the wild and no public exploit code.
Other vulnerabilities in Elastic Kibana
Sources
Also known as BIT-elk-2026-0543, BIT-kibana-2026-0543, GHSA-p2g6-3qpg-4v6h, MINI-2hhm-v6gh-r5rf, MINI-4pq5-mh2f-835c, MINI-7r6g-459q-r99x and 3 more.