CVE-2026-21723

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-23. the CNA's CVSS baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:grafana, epss, ghsa
Trending — Patch released this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 23, 2026

Last Modified

August 27, 2026

Advisory Details (1)

Auto-updated Jul 26, 2026
No patch confirmed yet.
generic

DoS Vulnerability in Templates Test endpoint | Grafana Labs

https://grafana.com/security/security-advisories/cve-2026-21723

Vendor Advisories for CVE-2026-21723(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatgrafana12-4-main-12.4.10-0.1.hum12026-09-08redhat
redhatgrafana13-2-main-13.2.1-0.1.hum12026-09-03redhat
redhatgrafana13-1-main-13.1.3-0.5.hum12026-09-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 16× in last 7d / 77× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 135 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-10 21:12 UTCEG score recompute
  3. 2026-09-10 21:12 UTCVendor advisory
  4. 2026-09-10 21:12 UTCGHSA enrichment
  5. 2026-09-10 09:34 UTCEPSS rescore
  6. 2026-09-09 09:10 UTCEG score recompute
  7. 2026-09-09 09:10 UTCVendor advisory
  8. 2026-09-09 09:10 UTCGHSA enrichment
  9. 2026-09-08 22:00 UTCEPSS rescore
  10. 2026-09-07 21:39 UTCEG score recompute
  11. 2026-09-07 21:39 UTCGHSA enrichment
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-05 19:32 UTCEG score recompute
  16. 2026-09-05 19:32 UTCGHSA enrichment
  17. 2026-09-04 13:39 UTCEG score recompute
  18. 2026-09-04 13:39 UTCGHSA enrichment
  19. 2026-09-04 05:06 UTCEPSS rescore
  20. 2026-09-02 14:11 UTCEPSS rescore
  21. 2026-09-01 23:29 UTCEG score recompute
  22. 2026-09-01 23:29 UTCGHSA enrichment
  23. 2026-09-01 13:53 UTCEPSS rescore
  24. 2026-09-01 04:39 UTCEPSS rescore
  25. 2026-08-31 01:38 UTCEG score recompute
Show 75 more
  1. 2026-08-31 01:38 UTCGHSA enrichment
  2. 2026-08-30 19:17 UTCEPSS rescore
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-30 00:48 UTCEG score recompute
  5. 2026-08-30 00:47 UTCGHSA enrichment
  6. 2026-08-28 21:41 UTCEPSS rescore
  7. 2026-08-27 18:01 UTCEG score recompute
  8. 2026-08-27 18:01 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 10:15 UTCEG score recompute
  11. 2026-08-27 10:15 UTCGHSA enrichment
  12. 2026-08-26 14:46 UTCEPSS rescore
  13. 2026-08-26 09:12 UTCGHSA enrichment
  14. 2026-08-25 14:52 UTCEG score recompute
  15. 2026-08-25 14:52 UTCGHSA enrichment
  16. 2026-08-25 13:48 UTCEPSS rescore
  17. 2026-08-24 14:02 UTCEG score recompute
  18. 2026-08-24 14:02 UTCGHSA enrichment
  19. 2026-08-23 22:32 UTCEG score recompute
  20. 2026-08-23 22:32 UTCGHSA enrichment
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-22 21:43 UTCEG score recompute
  23. 2026-08-22 21:43 UTCGHSA enrichment
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 20:53 UTCEG score recompute
  26. 2026-08-21 20:53 UTCGHSA enrichment
  27. 2026-08-20 22:55 UTCEPSS rescore
  28. 2026-08-20 20:03 UTCGHSA enrichment
  29. 2026-08-19 19:14 UTCGHSA enrichment
  30. 2026-08-19 18:58 UTCGHSA enrichment
  31. 2026-08-19 17:50 UTCEG score recompute
  32. 2026-08-19 17:50 UTCGHSA enrichment
  33. 2026-08-19 17:03 UTCEPSS rescore
  34. 2026-08-18 22:32 UTCEG score recompute
  35. 2026-08-18 22:32 UTCGHSA enrichment
  36. 2026-08-18 13:48 UTCEPSS rescore
  37. 2026-08-17 21:43 UTCGHSA enrichment
  38. 2026-08-17 17:32 UTCEG score recompute
  39. 2026-08-17 17:32 UTCGHSA enrichment
  40. 2026-08-17 13:47 UTCEPSS rescore
  41. 2026-08-16 16:43 UTCEG score recompute
  42. 2026-08-16 16:43 UTCGHSA enrichment
  43. 2026-08-16 14:56 UTCEPSS rescore
  44. 2026-08-16 02:14 UTCEPSS rescore
  45. 2026-08-15 15:54 UTCEG score recompute
  46. 2026-08-15 15:54 UTCGHSA enrichment
  47. 2026-08-15 01:30 UTCEPSS rescore
  48. 2026-08-14 15:05 UTCEG score recompute
  49. 2026-08-14 15:05 UTCGHSA enrichment
  50. 2026-08-13 22:00 UTCEPSS rescore
  51. 2026-08-13 14:15 UTCEG score recompute
  52. 2026-08-13 14:15 UTCGHSA enrichment
  53. 2026-08-12 13:50 UTCEPSS rescore
  54. 2026-08-12 13:26 UTCGHSA enrichment
  55. 2026-08-12 06:25 UTCEG score recompute
  56. 2026-08-12 06:25 UTCGHSA enrichment
  57. 2026-08-11 13:42 UTCEPSS rescore
  58. 2026-08-11 05:34 UTCGHSA enrichment
  59. 2026-08-11 00:50 UTCEG score recompute
  60. 2026-08-11 00:50 UTCGHSA enrichment
  61. 2026-08-11 00:00 UTCEPSS rescore
  62. 2026-08-10 00:01 UTCEG score recompute
  63. 2026-08-10 00:01 UTCGHSA enrichment
  64. 2026-08-09 13:46 UTCEPSS rescore
  65. 2026-08-08 23:12 UTCEG score recompute
  66. 2026-08-08 23:12 UTCGHSA enrichment
  67. 2026-08-08 16:37 UTCEPSS rescore
  68. 2026-08-07 22:22 UTCEG score recompute
  69. 2026-08-07 22:22 UTCGHSA enrichment
  70. 2026-08-06 21:33 UTCEG score recompute
  71. 2026-08-06 21:33 UTCGHSA enrichment
  72. 2026-08-06 13:46 UTCEPSS rescore
  73. 2026-08-05 20:44 UTCEG score recompute
  74. 2026-08-05 20:44 UTCGHSA enrichment
  75. 2026-08-05 19:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-21723?
CVE-2026-21723 is a medium vulnerability published on July 23, 2026. 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…
When was CVE-2026-21723 disclosed?
CVE-2026-21723 was first published in the National Vulnerability Database on July 23, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21723 actively exploited?
CVE-2026-21723 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 74.4% of all scored CVEs.
What is the CVSS score of CVE-2026-21723?
CVE-2026-21723 has a CVSS v4.0 base score of 5.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-21723?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21723, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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