---
cve: "CVE-2026-26934"
severity: "MEDIUM"
cvss: 6.5
epss: "0.5%"
vendor: "Elastic"
kev: false
exploited: false
published: "2026-02-26 18:23:07"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-02T12:59:19+02:00"
---

# CVE-2026-26934

> 6.5 MEDIUM

## Beschreibung

Improper Validation of Specified Quantity in Input (CWE-1284) in Kibana can allow an authenticated attacker with view-only privileges to cause a Denial of Service via Input Data Manipulation (CAPEC-153). An attacker can send a specially crafted, malformed payload causing excessive resource consumption and resulting in Kibana becoming unresponsive or crashing.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-1284** — Improper Validation of Specified Quantity in Input
  The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

## Patch verfügbar (OSV)

- 840cd2a58b052d1632219ee0b8dcc0f364226287 (Commit)
- b6e59ddaac5fc0c537d10132b2a1d5511ff8b1b5 (Commit)

## BSI-Hinweise (deutsch)

- [Kibana: Mehrere Schwachstellen ermöglichen Denial of Service und Offenlegung von Informationen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-0545)

## Referenzen

- <https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-12/385248>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-26934) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_