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CVE-2026-44427: modelcontextprotocol registry Open Redirect

CVSS: 0.0v4.0UnknownDeferred
AliasesCGA-2mg8-whx6-5273CGA-rx5v-xgvr-w43cGHSA-v8vw-gw5j-w7m6
Published 14-05-2026Last modified 15-05-2026
Open JSON

Vulnerability summary

CVE-2026-44427 is a Open Redirect vulnerability in modelcontextprotocol registry with no CVSS score yet. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.9% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
0.0/10
010
Unknown · v4.0 (CVE.org)
EPSS score
0.44%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1CGA-C9CM-RV2Q-J4X3

Timeline

  1. 14-05-2026
    PublishedVulnerability first disclosed.
  2. 15-05-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

+0.03 pp

From 0.41% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.44%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard1 product
  • goreleaser< 2.15.4-r2 | < 2.15.4-r1
Github.com/modelcontextprotocol1 product
  • registry≥ 1.1.0, < 1.7.5
Modelcontextprotocol1 product
Wolfi1 product
  • goreleaser< 2.15.4-r2 | < 2.15.4-r1

4 vendors · 4 products

References

7 links