Bug 2549285 (CVE-2026-108859) - CVE-2026-108859 github.com/mark3labs/mcp-go: mcp-go: Denial of Service via unbounded HTTP request body buffering
Summary: CVE-2026-108859 github.com/mark3labs/mcp-go: mcp-go: Denial of Service via un...
Keywords:
Status: NEW
Alias: CVE-2026-108859
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-11 13:41 UTC by OSIDB Bzimport
Modified: 2026-10-12 04:02 UTC (History)
1 user (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-11 13:41:29 UTC 
mcp-go through 1.2.1 contains a denial of service vulnerability in StreamableHTTPServer.ServeHTTP that allows remote unauthenticated attackers to exhaust memory by sending oversized POST bodies. Attackers can send arbitrarily large or many concurrent POST requests, read fully via io.ReadAll before validation, to degrade or OOM-kill the server process.
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