Critical Security Update for Grafana: Privilege Escalation Vulnerability
Summary
ALSA-2026:35827: Important: grafana security update. Affects grafana versions < 10.2.6-27.el10_2. Fixed in 10.2.6-27.el10_2. How to fix ↓
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Background
Grafana is an open-source platform designed for monitoring and observability, allowing users to visualize and analyze metrics from various data sources such as Graphite, InfluxDB, and OpenTSDB. It is widely used for creating dashboards and graphs, making it a vital tool for developers and system administrators. However, a recent vulnerability has been identified that could potentially allow unauthorized users to escalate their privileges within the application.
Vulnerability Detail
The vulnerability originates from the golang.org/x/net/idna package, which is responsible for processing Punycode labels. An incorrect handling of these labels can lead to privilege escalation, allowing attackers to gain unauthorized access to sensitive functionalities within Grafana. This issue is tracked under CVE-2026-39821 and poses a significant risk to users who have not updated to the patched version.
How To Fix
Minimum fixed version
10.2.6-27.el10_2
This is the first release that contains the fix.
sudo dnf update grafanaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can restrict access to Grafana by implementing stricter authentication mechanisms or by limiting user permissions until the update can be applied. However, this is not a permanent solution and should not replace the necessary updates.
Conclusion
In summary, the recent privilege escalation vulnerability in Grafana, identified as CVE-2026-39821, poses a significant risk to users. It is crucial to update to the patched version 10.2.6-27.el10_2 to protect against potential exploits. Users are encouraged to monitor their applications for vulnerabilities using tools like Vulert.
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FAQ
CVE-2026-39821 is the identifier for the privilege escalation vulnerability found in the golang.org/x/net/idna package used by Grafana.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failing to update Grafana could allow attackers to exploit the privilege escalation vulnerability, potentially leading to unauthorized access to sensitive data and functionalities.
Yes, Vulert provides a service that monitors and alerts for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
If an immediate update is not possible, consider implementing stricter access controls and monitoring user activities to mitigate potential risks until the update can be applied.
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