CVE-2026-108395Model Context Protocol Java SDK HTTP server transports allow memory exhaustion through unbounded request bodies
Updated under an hour ago ()
Does this affect you?
It affects modelcontextprotocol io.modelcontextprotocol.sdk:mcp and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.61%, higher than 48% of scored CVEs.
Do this next
Free account, 1 product
The Model Context Protocol Java SDK is the official Java SDK for Model Context Protocol servers and clients. From version 0.8.0 through 0.12.0 in the io.modelcontextprotocol.sdk:mcp artifact, from 0.13.0 through 0.18.3 and 1.0.0 through 1.1.3 in io.modelcontextprotocol.sdk:mcp-core, and from mcp-core 2.0.0-M1 through 2.0.0, the Servlet-based SSE, Streamable HTTP, and Stateless server transports read an HTTP request body into memory without enforcing a maximum size. An unauthenticated remote client able to reach an affected transport can stream an arbitrarily large POST body, including with chunked transfer encoding, until the Java process exhausts its heap and becomes unavailable. Authentication, Origin or Host validation, or an upstream request-size limit can reject the request before the vulnerable read. The maintained mcp-core lines are fixed in versions 0.18.4, 1.1.4, and 2.0.1.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.61% (percentile 48)
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
modelcontextprotocol io.modelcontextprotocol.sdk:mcp modelcontextprotocol:io.modelcontextprotocol.sdk_mcp (from the name) | from 0.8.0, < 0.13.0 | CNA record |
modelcontextprotocol io.modelcontextprotocol.sdk:mcp-core modelcontextprotocol:io.modelcontextprotocol.sdk_mcp_core (from the name) | from 0.13.0, < 0.18.4; from 1.0.0, < 1.1.4; from 2.0.0-M1, < 2.0.1 | CNA record |
References
- https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-4x8c-5vv7-973fx-refsource-confirm
- https://github.com/modelcontextprotocol/java-sdk/commit/1499df22c7023aa257223143a5dcf5b1db7ef80dx-refsource-misc
- https://github.com/modelcontextprotocol/java-sdk/commit/6a41dedaa0625551582d8247e5a4d78eae1131b2x-refsource-misc
- https://github.com/modelcontextprotocol/java-sdk/commit/8c0fdd1b1f76adba3ce7945d29f73fa2ddc66598x-refsource-misc
- https://github.com/modelcontextprotocol/java-sdk/commit/9e4d5fa827b6ba69457f5fd93573184789528efax-refsource-misc
- https://github.com/modelcontextprotocol/java-sdk/releases/tag/v0.18.4x-refsource-misc
- https://github.com/modelcontextprotocol/java-sdk/releases/tag/v1.1.4x-refsource-misc
- https://github.com/modelcontextprotocol/java-sdk/releases/tag/v2.0.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.