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CVE-2026-8609— Pre-authentication denial of service via the OAuth login route

Quick assessment

Affected
Grafana Grafana OSS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grafana OSS是Grafana公司开源的一个可视化仪表盘。 Grafana OSS存在资源管理错误漏洞，该漏洞源于未经身份验证的攻击者使用唯一值重复调用Grafana的OAuth登录路由，导致无限制的内存增长，最终耗尽内存并使Grafana实例崩溃（拒绝服务）。以下版本受到影响：11.6.0至11.6.14版本、12.2.0至12.2.8版本、12.3.0至12.3.6版本、12.4.0至12.4.3版本和13.0.0至13.0.1版本。

CVSS 5.3 · Medium EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 5

VendorProduct Version RangeStatus
Grafana Grafana OSS 11.6.0≤ 11.6.14 affected
12.2.0≤ 12.2.8 affected
12.3.0≤ 12.3.6 affected
12.4.0≤ 12.4.3 affected
13.0.0≤ 13.0.1 affected
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I. Basic Information for CVE-2026-8609

Vulnerability Information
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Vulnerability Title
Pre-authentication denial of service via the OAuth login route
Source: CVE Program / CVE List V5
Vulnerability Description
An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values, causing unbounded memory growth that can eventually exhaust memory and crash the Grafana instance (denial of service).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Grafana OSS 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana OSS是Grafana公司开源的一个可视化仪表盘。 Grafana OSS存在资源管理错误漏洞，该漏洞源于未经身份验证的攻击者使用唯一值重复调用Grafana的OAuth登录路由，导致无限制的内存增长，最终耗尽内存并使Grafana实例崩溃（拒绝服务）。以下版本受到影响：11.6.0至11.6.14版本、12.2.0至12.2.8版本、12.3.0至12.3.6版本、12.4.0至12.4.3版本和13.0.0至13.0.1版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Grafana Grafana OSS 11.6.0 ~ 11.6.14 -

II. Public POCs for CVE-2026-8609

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III. Intelligence Information for CVE-2026-8609

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Vendor Advisories for CVE-2026-8609 (1)

Same Patch Batch · Grafana · 2026-07-10 · 3 CVEs total

CVE-2026-33382 7.5 HIGH Denial of service via unbounded request body size
CVE-2026-8595 6.8 MEDIUM Stored XSS in the table panel (TableNG)

IV. Related Vulnerabilities

Same product: Grafana OSS
Same vendor: Grafana
Same weakness: CWE-400

V. Comments for CVE-2026-8609

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