CVE-2026-27880Network attack vector

Unauthenticated server crash via unbounded request reads

Published Mar 27, 2026 · Updated Mar 27, 2026

Denial of service in Grafana allows remote attackers to crash the server via unauthenticated OpenFeature validation requests. The feature flag validation endpoints accept unbounded request values and read the entire input into process memory without a size limit. No authentication is required; an oversized request can exhaust available memory and terminate the Grafana server without affecting stored data integrity or confidentiality.

CVSS severity7.5
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Grafana allows remote attackers to crash the server via unauthenticated OpenFeature validation requests. The feature flag validation endpoints accept unbounded request values and read the entire input into process memory without a size limit. No authentication is required; an oversized request can exhaust available memory and terminate the Grafana server without affecting stored data integrity or confidentiality.

The record

CVE
CVE-2026-27880
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Grafana Labs
Product
Grafana
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v12.1.0 <v12.1.10
  2. Affected versionversion=v12.2.0 <v12.2.8
  3. Affected versionversion=v12.3.0 <v12.3.6
  4. Affected versionversion=v12.4.0 <v12.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grafana Labs · Grafanaversion=v12.1.0 <v12.1.10; version=v12.2.0 <v12.2.8; version=v12.3.0 <v12.3.6; version=v12.4.0 <v12.4.2

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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