CVE-2026-11624

CRITICALPre-NVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 88% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.4EG
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: 9.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced alongside the existing "--allowed-origins" flag, enabling users to specify permitted hosts at server startup. Both flags default to "*", allowing users to implement strict access controls as needed without breaking existing setups. If either flag is set to "*", the server will output a startup warning about potential vulnerabilities. Documentation has also been updated to highlight these security considerations.

CVSS v3
9.4
EG Score
9.4CRITICALmedium confidence
EG Risk
42
EG Risk 42/100

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
Severity94% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

Published

June 13, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Oct 2, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr.
github_pr Patch Available

feat: add allowed-hosts flag

Patch available: googleapis/mcp-toolbox v0.25.0 (PR #2254 merged 2026-01-08)

https://github.com/googleapis/mcp-toolbox/pull/2254
generic🟡 PoC Available

Default DNS-rebinding protection allows all domains by defaults · Issue #3113 · googleapis/mcp-toolbox · GitHub

https://github.com/googleapis/mcp-toolbox/issues/3113

Vendor Advisories for CVE-2026-11624(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFix by version rangeDependents
github.com/googleapis/genai-toolbox—
  • every version up to 0.25.0: fixed in 0.25.0
—
github.com/googleapis/mcp-toolbox—
  • every version up to 0.25.0: fixed in 0.25.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 23× 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 423 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-11624?
CVE-2026-11624 is a critical vulnerability published on June 13, 2026. The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced…
When was CVE-2026-11624 disclosed?
CVE-2026-11624 was first published on June 13, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11624 actively exploited?
CVE-2026-11624 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-11624?
CVE-2026-11624 has a CVSS base score of 9.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-11624?
A fix for CVE-2026-11624 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-11624 are linked in the Vendor Advisories panel on this page.

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