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 — 4 sources updated 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 20× in last 7d / 76× 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 158 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 73.9% 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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