Is CVE-2026-34237 in the CISA KEV catalog?

No. CVE-2026-34237 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-34237?

CVE-2026-34237 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2026-34237?

CVE-2026-34237 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34237?

Upgrade mcp java sdk to 1.0.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-34237

MEDIUM

6.1

CVSS v3

NVD

Description

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.

CWE-942

How to fix

Remediation Available

mcp java sdkNVD

Affected:< 1.0.1Fixed in:1.0.1CVE-2026-34237derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Patch2

Vendor Advisory1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-09.