CVE-2026-72639

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-13. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting option, and the allocation derived from that count is not accounted against any circuit breaker. An authenticated user holding only read privileges on a single searchable index can submit one small search request that causes the node to reserve an excessively large internal data structure. The allocation occurs before the existing highlighting safety limits are evaluated, so memory exhaustion raises a fatal error that terminates the Elasticsearch node process. This results in a denial of service for the affected node and degrades cluster routing and health. The defect is not volumetric and does not depend on the size of the indexed data, so a single request is sufficient.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 1, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

Elasticsearch 8.19.20, 9.4.5, 9.5.1 Security Update (ESA-2026-120) - Security Announcements - Discuss the Elastic Stack

https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-120/389503

Vendor Advisories for CVE-2026-72639(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 74× 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.

  1. 2026-09-19 03:39 UTCEG score recompute
  2. 2026-09-19 03:39 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 01:56 UTCEG score recompute
  5. 2026-09-18 01:56 UTCGHSA enrichment
  6. 2026-09-17 00:13 UTCEG score recompute
  7. 2026-09-17 00:13 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 22:30 UTCEG score recompute
  11. 2026-09-15 22:30 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-14 20:47 UTCGHSA enrichment
  14. 2026-09-13 17:30 UTCEG score recompute
  15. 2026-09-13 17:30 UTCGHSA enrichment
  16. 2026-09-12 15:48 UTCEG score recompute
  17. 2026-09-12 15:48 UTCGHSA enrichment
  18. 2026-09-12 15:02 UTCEPSS rescore
  19. 2026-09-11 14:53 UTCEPSS rescore
  20. 2026-09-11 14:06 UTCEG score recompute
  21. 2026-09-11 14:06 UTCGHSA enrichment
  22. 2026-09-10 12:24 UTCEG score recompute
  23. 2026-09-10 12:24 UTCGHSA enrichment
  24. 2026-09-10 09:35 UTCEPSS rescore
  25. 2026-09-09 09:40 UTCEG score recompute
Show 74 more
  1. 2026-09-09 09:40 UTCGHSA enrichment
  2. 2026-09-08 22:01 UTCEPSS rescore
  3. 2026-09-08 07:57 UTCEG score recompute
  4. 2026-09-08 07:57 UTCGHSA enrichment
  5. 2026-09-07 06:16 UTCEG score recompute
  6. 2026-09-07 06:15 UTCGHSA enrichment
  7. 2026-09-06 13:48 UTCEPSS rescore
  8. 2026-09-06 04:31 UTCEG score recompute
  9. 2026-09-06 04:31 UTCGHSA enrichment
  10. 2026-09-05 02:49 UTCEG score recompute
  11. 2026-09-05 02:48 UTCGHSA enrichment
  12. 2026-09-04 05:07 UTCEPSS rescore
  13. 2026-09-04 01:01 UTCGHSA enrichment
  14. 2026-09-02 23:00 UTCEG score recompute
  15. 2026-09-02 23:00 UTCGHSA enrichment
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-01 14:14 UTCEG score recompute
  18. 2026-09-01 14:14 UTCGHSA enrichment
  19. 2026-09-01 13:54 UTCEPSS rescore
  20. 2026-09-01 04:40 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-08-31 23:48 UTCGHSA enrichment
  23. 2026-08-30 22:06 UTCEG score recompute
  24. 2026-08-30 22:06 UTCGHSA enrichment
  25. 2026-08-30 19:18 UTCEPSS rescore
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 01:22 UTCEPSS rescore
  28. 2026-08-29 20:24 UTCEG score recompute
  29. 2026-08-29 20:24 UTCGHSA enrichment
  30. 2026-08-28 21:42 UTCEPSS rescore
  31. 2026-08-28 15:55 UTCGHSA enrichment
  32. 2026-08-27 20:38 UTCGHSA enrichment
  33. 2026-08-26 18:43 UTCEG score recompute
  34. 2026-08-26 18:43 UTCGHSA enrichment
  35. 2026-08-26 14:47 UTCEPSS rescore
  36. 2026-08-25 16:14 UTCEG score recompute
  37. 2026-08-25 16:14 UTCGHSA enrichment
  38. 2026-08-25 13:49 UTCEPSS rescore
  39. 2026-08-24 14:32 UTCEG score recompute
  40. 2026-08-24 14:32 UTCGHSA enrichment
  41. 2026-08-23 12:50 UTCEG score recompute
  42. 2026-08-23 12:50 UTCGHSA enrichment
  43. 2026-08-23 00:19 UTCEPSS rescore
  44. 2026-08-22 11:08 UTCEG score recompute
  45. 2026-08-22 11:08 UTCGHSA enrichment
  46. 2026-08-21 23:49 UTCEPSS rescore
  47. 2026-08-21 09:25 UTCEG score recompute
  48. 2026-08-21 09:25 UTCGHSA enrichment
  49. 2026-08-20 22:56 UTCEPSS rescore
  50. 2026-08-20 07:43 UTCEG score recompute
  51. 2026-08-20 07:43 UTCGHSA enrichment
  52. 2026-08-19 17:04 UTCEPSS rescore
  53. 2026-08-19 06:01 UTCEG score recompute
  54. 2026-08-19 06:00 UTCGHSA enrichment
  55. 2026-08-18 13:49 UTCEPSS rescore
  56. 2026-08-18 13:49 UTCEPSS rescore
  57. 2026-08-18 04:14 UTCEG score recompute
  58. 2026-08-18 04:13 UTCGHSA enrichment
  59. 2026-08-17 13:47 UTCEPSS rescore
  60. 2026-08-17 02:29 UTCEG score recompute
  61. 2026-08-17 02:29 UTCGHSA enrichment
  62. 2026-08-16 14:56 UTCEPSS rescore
  63. 2026-08-16 14:56 UTCEPSS rescore
  64. 2026-08-16 02:15 UTCEPSS rescore
  65. 2026-08-16 00:47 UTCEG score recompute
  66. 2026-08-16 00:47 UTCGHSA enrichment
  67. 2026-08-15 01:31 UTCEPSS rescore
  68. 2026-08-14 23:04 UTCEG score recompute
  69. 2026-08-14 23:04 UTCGHSA enrichment
  70. 2026-08-13 21:22 UTCEG score recompute
  71. 2026-08-13 20:37 UTCEG score recompute
  72. 2026-08-13 20:21 UTCEG score recompute
  73. 2026-08-13 19:22 UTCEG score recompute
  74. 2026-08-13 19:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72639?
CVE-2026-72639 is a medium vulnerability published on August 13, 2026. Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting option, and the allocation derived from that count is not accounted against any circuit breaker. An authenticated user holding only read privileges on a single searchable index can submit one…
When was CVE-2026-72639 disclosed?
CVE-2026-72639 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72639 actively exploited?
CVE-2026-72639 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 77.5% of all scored CVEs.
What is the CVSS score of CVE-2026-72639?
CVE-2026-72639 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-72639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72639, 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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