CVE-2026-21723 (GCVE-0-2026-21723)
Vulnerability from cvelistv5 – Published: 2026-07-23 01:48 – Updated: 2026-07-23 01:48
VLAI
EPSS
VEX
Title
CVE-2026-21723 Record
Summary
The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled.
Severity
5.3 (Medium)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://grafana.com/security/security-advisories/… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Grafana | Grafana OSS |
Affected:
8.0.0 , ≤ 11.0.0
(semver)
Affected: 11.0.0 , ≤ 11.6.10 (semver) Affected: 12.0.0 , ≤ 12.0.9 (semver) Affected: 12.1.0 , ≤ 12.1.6 (semver) Affected: 12.2.0 , ≤ 12.2.4 (semver) Affected: 12.3.0 , ≤ 12.3.2 (semver) |
Date Public
2026-07-22 01:42
Credits
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"version": "8.0.0",
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},
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},
{
"lessThanOrEqual": "12.2.4",
"status": "affected",
"version": "12.2.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "12.3.2",
"status": "affected",
"version": "12.3.0",
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}
]
}
],
"credits": [
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"lang": "en",
"type": "finder",
"value": "nacl (Researcher)"
}
],
"datePublic": "2026-07-22T01:42:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-23T01:48:16.245Z",
"orgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
"shortName": "GRAFANA"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://grafana.com/security/security-advisories/cve-2026-21723"
}
],
"source": {
"discovery": "BUG_BOUNTY"
},
"title": "CVE-2026-21723 Record",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
"assignerShortName": "GRAFANA",
"cveId": "CVE-2026-21723",
"datePublished": "2026-07-23T01:48:16.245Z",
"dateReserved": "2026-01-05T09:26:06.214Z",
"dateUpdated": "2026-07-23T01:48:16.245Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-21723",
"date": "2026-07-23",
"epss": "0.00327",
"percentile": "0.25076"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-21723\",\"sourceIdentifier\":\"security@grafana.com\",\"published\":\"2026-07-23T03:16:30.000\",\"lastModified\":\"2026-07-23T03:16:30.000\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled.\"}],\"affected\":[{\"source\":\"security@grafana.com\",\"affectedData\":[{\"vendor\":\"Grafana\",\"product\":\"Grafana OSS\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"8.0.0\",\"lessThanOrEqual\":\"11.0.0\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"11.0.0\",\"lessThanOrEqual\":\"11.6.10\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"12.0.0\",\"lessThanOrEqual\":\"12.0.9\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"12.1.0\",\"lessThanOrEqual\":\"12.1.6\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"12.2.0\",\"lessThanOrEqual\":\"12.2.4\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"12.3.0\",\"lessThanOrEqual\":\"12.3.2\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@grafana.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.6,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://grafana.com/security/security-advisories/cve-2026-21723\",\"source\":\"security@grafana.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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