CVE-2026-18688

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. A secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.1Exploit: None knownExposed services: Not assessed

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

An issue in MongoDB Server's aggregation framework could allow an authenticated user to trigger an out-of-bounds memory read by providing a specially formed numeric parameter in a certain aggregation pipeline stage. This could result in a server crash (denial of service) and may potentially expose a limited amount of memory contents.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100CISA SSVC

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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No patch confirmed yet.
generic

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https://jira.mongodb.org/browse/SERVER-129617

Vendor Advisories for CVE-2026-18688(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 18× in last 7d / 95× 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 193 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-18688?
CVE-2026-18688 is a high vulnerability published on August 11, 2026. An issue in MongoDB Server's aggregation framework could allow an authenticated user to trigger an out-of-bounds memory read by providing a specially formed numeric parameter in a certain aggregation pipeline stage. This could result in a server crash (denial of service) and may potentially expose…
When was CVE-2026-18688 disclosed?
CVE-2026-18688 was first published on August 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18688 actively exploited?
CVE-2026-18688 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18688?
CVE-2026-18688 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18688?
No fix for CVE-2026-18688 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18688 are linked in the Vendor Advisories panel on this page.

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