CVE-2026-108859 mcp-go - Denial of Service

mcp-go <= 1.2.1 contains a denial of service caused by memory exhaustion in StreamableHTTPServer.ServeHTTP due to reading oversized POST bodies before validation, letting remote unauthenticated attackers degrade or crash the server.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.55% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
11 October 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to the latest version of mcp-go.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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