CVE-2026-27880

High

Published: 27 March 2026

Published

27 March 2026

Modified

10 May 2026

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score 0.0002 6.3th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27880 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Grafana Grafana. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 6.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SC-6 (Resource Availability).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Validates feature toggle evaluation endpoint inputs to enforce bounds on value sizes, preventing unbounded memory reads that cause out-of-memory crashes.

SC-5 Denial-of-service Protection good match

preventdetect

Protects against denial-of-service events like memory exhaustion by limiting effects of unbounded input processing in the OpenFeature endpoint.

SC-6 Resource Availability good match

prevent

Enforces resource limits on memory allocation during endpoint evaluation to mitigate out-of-memory conditions from large inputs.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1499.004 Application or System Exploitation Impact

Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.

attack.mitre.org →

Why these techniques?

Unauthenticated remote exploitation of public-facing Grafana endpoint causes application crash via memory exhaustion, directly enabling T1190 (Exploit Public-Facing Application) for initial access/impact and T1499.004 (Application or System Exploitation) under Endpoint Denial of Service.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

The OpenFeature feature toggle evaluation endpoint reads unbounded values into memory, which can cause out-of-memory crashes.

Deeper analysisAI

CVE-2026-27880 is a vulnerability in the OpenFeature feature toggle evaluation endpoint within Grafana that allows attackers to read unbounded values into memory, resulting in out-of-memory crashes. Published on 2026-03-27, it has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is associated with CWE-787 (Out-of-bounds Write).

Unauthenticated remote attackers can exploit this vulnerability over the network with low attack complexity and no user interaction required. Successful exploitation leads to high-impact denial of service by triggering out-of-memory conditions that crash the affected Grafana instance.

The Grafana security advisory provides details on this issue, available at https://grafana.com/security/security-advisories/cve-2026-27880.