CVE-2026-49291: mcp-memory-service: OAuth read-only clients can write and delete memories through MCP tools/call

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-19 · updated 2026-10-25
Weakness: CWE-862

Description

mcp-memory-service is a semantic memory layer for AI applications. Prior to version 10.65.3, the HTTP MCP JSON-RPC endpoint at `/mcp` requires only OAuth `read` scope for all requests, then dispatches `tools/call` directly to handlers that include mutating tools. A read-only OAuth client can call `store_memory` and `delete_memory` through MCP even though the corresponding REST endpoints require `write` scope. Version 10.65.3 patches the issue.

Affected products

doobidoo mcp-memory-service: before 10.65.3

References

https://github.com/doobidoo/mcp-memory-service/security/advisories/GHSA-2r68-g678-7qr3
https://pypi.org/project/mcp-memory-service/10.65.3
https://web.archive.org/web/20260508112116/https://github.com/doobidoo/mcp-memory-service/

Get alerted when CVE-2026-49291 or the next vulnerability affects your stack