CVE-2026-44427

UNRATEDCVSS · not yet scoredTrending — 3 sources updated this weekElevated

Also known asEUVD-2026-30491 (ENISA EUVD) · GHSA-v8vw-gw5j-w7m6 (GitHub Security Advisories)Source: ENISA EUVD

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EchelonGraph verdictPlan a fixWithin your standard update timelines — no confirmed exploitation yet.
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS v2: —Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. From 1.1.0 to 1.7.4, the TrailingSlashMiddleware in internal/api/server.go is vulnerable to an open redirect attack. An attacker can craft a URL with a protocol-relative path (e.g., //evil.com/) that, after trailing slash removal, results in a Location header of //evil.com — which browsers interpret as an absolute URL to an external domain. This vulnerability is fixed in 1.7.5.

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 14, 2026

Last Modified

October 26, 2026

References (1)

Vendor Advisories for CVE-2026-44427(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
gogithub.com/modelcontextprotocol/registry @ 1.7.5 (fixes >= 1.1.0, < 1.7.5)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/modelcontextprotocol/registry—
  • 1.1.0 up to 1.7.5: fixed in 1.7.5
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Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 39× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 177 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 78 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-11-01 07:49 UTCGHSA enrichmentGHSA-v8vw-gw5j-w7m6 · GitHub severity MODERATE
  3. 2026-11-01 07:49 UTCEG score recompute
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-10-26 14:32 UTCEG score recompute
  11. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  12. 2026-10-25 14:27 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  14. 2026-10-24 03:55 UTCOSV refresh
  15. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  16. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  19. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-18 03:39 UTCEG score recompute
  22. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
Show 74 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-12 16:05 UTCEG score recompute
  4. 2026-10-11 19:47 UTCEG score recompute
  5. 2026-10-11 17:01 UTCEG score recompute
  6. 2026-10-11 14:27 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-09-30 13:32 UTCOSV refresh
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  22. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  27. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  28. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  29. 2026-09-11 20:10 UTCOSV refresh
  30. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  31. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  32. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  33. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  34. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  35. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  36. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  37. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  38. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  39. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  40. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  41. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  42. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  43. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  44. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  45. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  46. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  47. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  48. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  49. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  50. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  51. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  52. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  53. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  54. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  55. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  56. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  57. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  59. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  60. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  61. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  62. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  63. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  64. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  65. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  66. 2026-08-01 19:04 UTCEG score recompute
  67. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  68. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  69. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  70. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  71. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  72. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  73. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  74. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile

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Frequently asked(4)

What is CVE-2026-44427?
CVE-2026-44427 is a vulnerability whose severity is not yet rated; its CVE record was published on May 14, 2026. The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. From 1.1.0 to 1.7.4, the TrailingSlashMiddleware in internal/api/server.go is vulnerable to an open redirect attack. An attacker can craft a URL with a protocol-relative path (e.g., //evil.com/)…
When was the CVE record for CVE-2026-44427 published?
The CVE record for CVE-2026-44427 was published on May 14, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-44427 actively exploited?
CVE-2026-44427 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-44427?
A fix for CVE-2026-44427 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-44427 are linked in the Vendor Advisories panel on this page.

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