Critical Grafana Vulnerability: Privilege Escalation via Punycode Label Processing
Summary
ALSA-2026:35830: Important: grafana security update. Affects grafana versions < 9.2.10-31.el8_10. Fixed in 9.2.10-31.el8_10. How to fix ↓
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Background
Grafana is an open-source platform designed for monitoring and visualizing metrics from various data sources such as Graphite, InfluxDB, and OpenTSDB. It provides users with a rich dashboard and graph editor, enabling them to create insightful visualizations of their data. However, recent security findings have revealed a vulnerability in the package that could allow unauthorized privilege escalation, posing a significant risk to users and their data integrity.
Vulnerability Detail
The vulnerability stems from an issue in the golang.org/x/net/idna library, which is utilized by Grafana for processing Punycode labels. This flaw can be exploited to escalate privileges, allowing attackers to gain unauthorized access to sensitive functionalities within the application. The specific identifier for this vulnerability is CVE-2026-39821, which details the technical aspects and potential impact of the issue.
How To Fix
Minimum fixed version
9.2.10-31.el8_10
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 the Grafana application to trusted networks only, thereby minimizing exposure to potential attacks until the package is updated. Additionally, implementing strict user permissions can help limit the impact of any potential exploitation.
Conclusion
The identified vulnerability in Grafana poses a significant risk due to the potential for privilege escalation. Users are strongly encouraged to update their installations to the latest patched version to safeguard against exploitation. Additionally, utilizing tools like Vulert can help maintain awareness of vulnerabilities in open-source software.
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FAQ
CVE-2026-39821 is the identifier for a vulnerability in Grafana that allows privilege escalation due to improper handling of Punycode labels.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failure to address this vulnerability could lead to unauthorized access to sensitive data and functionalities within Grafana, compromising the security of your monitoring environment.
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 immediate updates are not possible, consider implementing network restrictions and strict user permissions as temporary workarounds to reduce exposure.
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