CVE-2026-14540

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-31. NVD baseline CVSS 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A Server-Side Request Forgery (SSRF) vulnerability exists in the generic HTTP source and tool components of Google mcp-toolbox versions 0.3.0 through 1.4.0. While the toolbox implements baseline input sanitization for user-controlled parameters, the underlying HTTP client (internal/sources/http/http.go) fails to safely regulate request redirection boundaries. Specifically, the client is initialized without a restrictive CheckRedirect policy hook and lacks target IP validation. An attacker or a malicious data-driven prompt can supply a crafted path parameter that triggers an open redirect or a direct destination swap on the target backend, coercing the mcp-toolbox into blindly following the redirection and making unauthorized requests to internal or arbitrary external endpoints.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100CISA 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
Severity61% × 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
0.1%
EPSS %ILE
2nd
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 total (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(source/http): implement SSRF guard

Patch available: googleapis/mcp-toolbox v1.5.0 (PR #3448 merged 2026-06-18)

https://github.com/googleapis/mcp-toolbox/pull/3448

Vendor Advisories for CVE-2026-14540(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 13× in last 7d / 58× 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 167 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-14540?
CVE-2026-14540 is a medium vulnerability published on July 31, 2026. A Server-Side Request Forgery (SSRF) vulnerability exists in the generic HTTP source and tool components of Google mcp-toolbox versions 0.3.0 through 1.4.0. While the toolbox implements baseline input sanitization for user-controlled parameters, the underlying HTTP client…
When was CVE-2026-14540 disclosed?
CVE-2026-14540 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-2026-14540 actively exploited?
CVE-2026-14540 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-14540?
CVE-2026-14540 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-14540?
A fix for CVE-2026-14540 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-14540 are linked in the Vendor Advisories panel on this page.

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