CVE-2026-14539

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory published 2026-07-31. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An allocation of resources without limits vulnerability in the HTTP handler component of Google mcp-toolbox versions up to and including 1.4.0 allows an unauthenticated attacker to cause a denial of service (DoS). The /mcp endpoint handler reads incoming payloads directly into system memory using an unrestricted buffer loop (io.ReadAll) without applying defensive constraints such as http.MaxBytesReader or pre-read Content-Length enforcement. By submitting a single, massive HTTP request body, an attacker can linearly consume available host memory until the runtime process is terminated by an Out-Of-Memory (OOM) error.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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

July 31, 2026

Last Modified

August 8, 2026

Advisory Details (1)

Auto-updated Jul 31, 2026
Patch available. Sources: github_pr.
github_pr Patch Available

fix: bound MCP HTTP body size

Patch available: googleapis/mcp-toolbox v1.5.0 (PR #3216 merged 2026-06-12)

https://github.com/googleapis/mcp-toolbox/pull/3216

Vendor Advisories for CVE-2026-14539(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 16× in last 7d / 80× 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 212 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-14539?
CVE-2026-14539 is a high vulnerability published on July 31, 2026. An allocation of resources without limits vulnerability in the HTTP handler component of Google mcp-toolbox versions up to and including 1.4.0 allows an unauthenticated attacker to cause a denial of service (DoS). The /mcp endpoint handler reads incoming payloads directly into system memory using…
When was CVE-2026-14539 disclosed?
CVE-2026-14539 was first published on July 31, 2026, with the most recent update on August 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14539 actively exploited?
CVE-2026-14539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-14539?
CVE-2026-14539 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-14539?
A fix for CVE-2026-14539 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-14539 are linked in the Vendor Advisories panel on this page.

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