Critical Security Update for Grafana: Privilege Escalation Vulnerability
Summary
ALSA-2026:35828: Important: grafana security update. Affects grafana versions < 10.2.6-23.el9_8. Fixed in 10.2.6-23.el9_8. How to fix ↓
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Background
Grafana is an open-source analytics and monitoring platform that allows users to visualize and analyze data from various sources such as Graphite, InfluxDB, and OpenTSDB. It provides a rich set of features including customizable dashboards, alerting, and data source integrations. However, a recent vulnerability has been identified in the package that could allow unauthorized privilege escalation due to improper handling of Punycode label processing.
Vulnerability Detail
The vulnerability, identified as CVE-2026-39821, originates from the golang.org/x/net/idna package used within Grafana. It allows attackers to exploit incorrect Punycode label processing, potentially leading to privilege escalation. This could enable unauthorized users to gain elevated access rights, compromising the security and integrity of the Grafana instance and the data it manages.
How To Fix
Minimum fixed version
10.2.6-23.el9_8
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
Currently, there are no specific workarounds available for this vulnerability. The best course of action is to apply the security update as soon as it is feasible.
Conclusion
The identified vulnerability in Grafana poses a significant risk due to potential privilege escalation. Users are strongly encouraged to update to the latest patched version to safeguard their systems. Regular monitoring for vulnerabilities using tools like Vulert can help maintain security in open-source applications.
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FAQ
CVE-2026-39821 is a vulnerability in Grafana that allows for privilege escalation due to improper processing 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.
If exploited, this vulnerability could allow unauthorized users to gain elevated privileges, potentially compromising sensitive data and system integrity.
Yes, a patch is available in version 10.2.6-23.el9_8 of Grafana. It is recommended to update to this version immediately.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risk associated with this vulnerability.
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