grafana/grafana-enterprise: Uncontrolled Resource Consumption
CVE-2026-21720 is a high-severity uncontrolled resource consumption vulnerability in grafana/grafana-enterprise from Grafana, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 11.6.9, 12.0.8, 12.1.5 as the first without the flaw, so updating grafana/grafana-enterprise to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.69% chance of exploitation within 30 days, higher than 53% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update grafana/grafana-enterprise to 11.6.9 or 12.0.8 or 12.1.5 or 12.2.3, whichever matches your release line, or a later version.
- Update grafana/grafana to 11.6.9 or 12.0.8 or 12.1.5 or 12.2.3, whichever matches your release line, or a later version.
- Update Grafana to 11.6.9 or 12.0.8 or 12.1.5 or 12.2.3, whichever matches your release line, or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Grafana | grafana/grafana-enterprise | 3.0.0 up to, but not including, 11.6.9; 3.0.0 up to, but not including, 12.0.8; 3.0.0 up to, but not including, 12.1.5; 3.0.0 up to, but not including, 12.2.3; 3.0.0 up to, but not including, 12.3.1 | 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1 |
| Grafana | grafana/grafana | 3.0.0 up to, but not including, 11.6.9; 3.0.0 up to, but not including, 12.0.8; 3.0.0 up to, but not including, 12.1.5; 3.0.0 up to, but not including, 12.2.3; 3.0.0 up to, but not including, 12.3.1 | 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1 |
| Red Hat | Red Hat Ceph Storage 7 | Not specified in the record | Not stated |
| Red Hat | Red Hat Ceph Storage 8 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 10 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 8 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9 | Not specified in the record | Not stated |
| Grafana | Grafana | 3.0.0 up to, but not including, 11.6.9; 12.0.0 up to, but not including, 12.0.8; 12.1.0 up to, but not including, 12.1.5; 12.2.0 up to, but not including, 12.2.3; 12.3.0 | 11.6.9, 12.0.8, 12.1.5, 12.2.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (grafana.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CNA (grafana.com) |
| CVSS 3.1 | 7.5 | High | CNA |
Official description
Every uncached /avatar/:hash request spawns a goroutine that refreshes the Gravatar image. If the refresh sits in the 10-slot worker queue longer than three seconds, the handler times out and stops listening for the result, so that goroutine blocks forever trying to send on an unbuffered channel. Sustained traffic with random hashes keeps tripping this timeout, so goroutine count grows linearly, eventually exhausting memory and causing Grafana to crash on some systems.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
How developers prevent this class of flaw
- Ensure that protocols have specific limits of scale placed on them.
- Ensure that all failures in resource allocation place the system into a safe posture.
More Uncontrolled Resource Consumption vulnerabilities (CWE-400)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in grafana/grafana-enterprise
- 8.1 High severity
Recent Uncontrolled Resource Consumption vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
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