CVE-2026-14539

HIGHNVD 7.57.5—
EchelonGraph scoreHIGH 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%CVSS: 7.5Exploit: None knownExposed: 0

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

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
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

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 27× in last 7d / 81× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 19:38 UTCGHSA enrichment
  3. 2026-08-20 08:41 UTCGHSA enrichment
  4. 2026-08-19 21:44 UTCEG score recompute
  5. 2026-08-19 21:44 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 10:46 UTCGHSA enrichment
  8. 2026-08-18 23:49 UTCEG score recompute
  9. 2026-08-18 23:49 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 12:52 UTCGHSA enrichment
  12. 2026-08-18 01:35 UTCGHSA enrichment
  13. 2026-08-17 14:38 UTCEG score recompute
  14. 2026-08-17 14:38 UTCGHSA enrichment
  15. 2026-08-17 03:40 UTCGHSA enrichment
  16. 2026-08-16 16:42 UTCEG score recompute
  17. 2026-08-16 16:42 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 05:45 UTCEG score recompute
  20. 2026-08-16 05:45 UTCGHSA enrichment
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 18:48 UTCGHSA enrichment
  23. 2026-08-15 07:51 UTCEG score recompute
  24. 2026-08-15 07:51 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 56 more
  1. 2026-08-14 20:53 UTCGHSA enrichment
  2. 2026-08-14 09:56 UTCGHSA enrichment
  3. 2026-08-13 22:59 UTCEG score recompute
  4. 2026-08-13 22:59 UTCGHSA enrichment
  5. 2026-08-13 22:00 UTCEPSS rescore
  6. 2026-08-13 12:02 UTCGHSA enrichment
  7. 2026-08-13 01:05 UTCGHSA enrichment
  8. 2026-08-12 14:08 UTCEG score recompute
  9. 2026-08-12 14:08 UTCGHSA enrichment
  10. 2026-08-12 13:50 UTCEPSS rescore
  11. 2026-08-12 03:11 UTCGHSA enrichment
  12. 2026-08-11 16:13 UTCEG score recompute
  13. 2026-08-11 16:13 UTCGHSA enrichment
  14. 2026-08-11 13:42 UTCEPSS rescore
  15. 2026-08-11 05:16 UTCEG score recompute
  16. 2026-08-11 05:16 UTCGHSA enrichment
  17. 2026-08-10 23:59 UTCEPSS rescore
  18. 2026-08-10 18:19 UTCGHSA enrichment
  19. 2026-08-10 07:22 UTCGHSA enrichment
  20. 2026-08-09 20:24 UTCEG score recompute
  21. 2026-08-09 20:24 UTCGHSA enrichment
  22. 2026-08-09 13:46 UTCEPSS rescore
  23. 2026-08-09 09:27 UTCGHSA enrichment
  24. 2026-08-08 22:30 UTCEG score recompute
  25. 2026-08-08 22:30 UTCGHSA enrichment
  26. 2026-08-08 16:37 UTCEPSS rescore
  27. 2026-08-08 11:32 UTCGHSA enrichment
  28. 2026-08-08 00:34 UTCEG score recompute▲ 0.90
  29. 2026-08-08 00:34 UTCGHSA enrichment
  30. 2026-08-08 00:34 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  31. 2026-08-07 17:58 UTCEG score recompute
  32. 2026-08-07 17:58 UTCGHSA enrichment
  33. 2026-08-06 15:50 UTCEG score recompute
  34. 2026-08-06 15:50 UTCGHSA enrichment
  35. 2026-08-06 13:46 UTCEPSS rescore
  36. 2026-08-06 03:01 UTCEG score recompute
  37. 2026-08-06 03:01 UTCGHSA enrichment
  38. 2026-08-05 19:17 UTCEPSS rescore
  39. 2026-08-05 00:54 UTCEG score recompute
  40. 2026-08-05 00:54 UTCGHSA enrichment
  41. 2026-08-04 15:09 UTCEPSS rescore
  42. 2026-08-04 10:38 UTCEPSS rescore
  43. 2026-08-03 22:46 UTCEG score recompute
  44. 2026-08-03 22:46 UTCGHSA enrichment
  45. 2026-08-03 10:35 UTCEPSS rescore
  46. 2026-08-02 20:39 UTCEG score recompute
  47. 2026-08-02 20:39 UTCGHSA enrichment
  48. 2026-08-02 02:26 UTCEPSS rescore
  49. 2026-08-01 18:31 UTCEG score recompute
  50. 2026-08-01 18:31 UTCGHSA enrichment
  51. 2026-08-01 04:15 UTCEPSS rescore
  52. 2026-07-31 16:23 UTCEG score recompute
  53. 2026-07-31 16:23 UTCGHSA enrichment
  54. 2026-07-31 02:40 UTCEG score recompute
  55. 2026-07-31 01:55 UTCEG score recompute
  56. 2026-07-31 01:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 88.5% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14539, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-14539

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