CVE-2026-14540

MEDIUMNVD 6.16.1—
EchelonGraph scoreHIGH 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%CVSS: 6.1Exploit: None knownExposed: 0

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

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
6.1(high)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
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(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 18× in last 7d / 72× 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 01:03 UTCEG score recompute
  3. 2026-08-20 01:03 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-18 22:48 UTCEG score recompute
  6. 2026-08-18 22:48 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-17 20:24 UTCEG score recompute
  9. 2026-08-17 20:24 UTCGHSA enrichment
  10. 2026-08-16 18:10 UTCEG score recompute
  11. 2026-08-16 18:10 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 15:56 UTCEG score recompute
  15. 2026-08-15 15:56 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 13:41 UTCEG score recompute
  18. 2026-08-14 13:41 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 11:27 UTCEG score recompute
  21. 2026-08-13 11:27 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-12 09:13 UTCEG score recompute
  24. 2026-08-12 09:13 UTCGHSA enrichment
  25. 2026-08-11 13:42 UTCEPSS rescore
Show 47 more
  1. 2026-08-11 06:58 UTCEG score recompute
  2. 2026-08-11 06:58 UTCGHSA enrichment
  3. 2026-08-10 23:59 UTCEPSS rescore
  4. 2026-08-10 04:44 UTCEG score recompute
  5. 2026-08-10 04:44 UTCGHSA enrichment
  6. 2026-08-09 13:46 UTCEPSS rescore
  7. 2026-08-09 02:31 UTCEG score recompute
  8. 2026-08-09 02:31 UTCGHSA enrichment
  9. 2026-08-08 16:37 UTCEPSS rescore
  10. 2026-08-08 00:17 UTCEG score recompute▼ 1.90
  11. 2026-08-08 00:17 UTCGHSA enrichment
  12. 2026-08-08 00:16 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  13. 2026-08-07 13:54 UTCGHSA enrichment
  14. 2026-08-07 02:52 UTCGHSA enrichment
  15. 2026-08-06 15:50 UTCEG score recompute
  16. 2026-08-06 15:50 UTCGHSA enrichment
  17. 2026-08-06 13:46 UTCEPSS rescore
  18. 2026-08-06 04:54 UTCEG score recompute
  19. 2026-08-06 04:54 UTCGHSA enrichment
  20. 2026-08-05 19:17 UTCEPSS rescore
  21. 2026-08-05 17:52 UTCGHSA enrichment
  22. 2026-08-05 06:51 UTCGHSA enrichment
  23. 2026-08-04 19:49 UTCEG score recompute
  24. 2026-08-04 19:49 UTCGHSA enrichment
  25. 2026-08-04 15:09 UTCEPSS rescore
  26. 2026-08-04 10:38 UTCEPSS rescore
  27. 2026-08-04 08:47 UTCGHSA enrichment
  28. 2026-08-03 21:46 UTCGHSA enrichment
  29. 2026-08-03 10:43 UTCEG score recompute
  30. 2026-08-03 10:43 UTCGHSA enrichment
  31. 2026-08-03 10:35 UTCEPSS rescore
  32. 2026-08-02 23:34 UTCGHSA enrichment
  33. 2026-08-02 12:33 UTCEG score recompute
  34. 2026-08-02 12:33 UTCGHSA enrichment
  35. 2026-08-02 02:26 UTCEPSS rescore
  36. 2026-08-02 01:31 UTCGHSA enrichment
  37. 2026-08-01 14:29 UTCEG score recompute
  38. 2026-08-01 14:29 UTCGHSA enrichment
  39. 2026-08-01 04:15 UTCEPSS rescore
  40. 2026-08-01 03:27 UTCEG score recompute
  41. 2026-08-01 03:26 UTCGHSA enrichment
  42. 2026-07-31 16:23 UTCEG score recompute
  43. 2026-07-31 16:23 UTCGHSA enrichment
  44. 2026-07-31 13:42 UTCGHSA enrichment
  45. 2026-07-31 02:40 UTCEG score recompute
  46. 2026-07-31 01:55 UTCEG score recompute
  47. 2026-07-31 01:54 UTCMITRE cvelistV5first tracked

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 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-2026-14540 actively exploited?
CVE-2026-14540 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 98.1% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14540, 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

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