Vulnerability · Published Jun 19, 2026 · Assigned by GitHub_M

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

High 8.1

In plain English

A high-severity missing authorization in mcp-memory-service from doobidoo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.5%top 57.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	mcp-memory-service	10.65.3	GHSA-2r68-g678-7qr3
PyPI	mcp-memory-service	10.65.3	PYSEC-2026-2622

Affected products (as reported)

Vendor	Product	Versions
doobidoo	mcp-memory-service	< 10.65.3

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References

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