High · CVSS 8.6CVE-2026-111767GHSA-22JM-H49P-29QW

MCP TypeScript SDK: Experimental tasks were not tied to the session that created themCVE-2026-111767

Answer in brief

CVE-2026-111767 records a High severity (CVSS 8.6) vulnerability in MCP TypeScript SDK: Experimental tasks were not tied to the session that created them. The current sources do not mark it as known exploited. The current feed maps modelcontextprotocol/typescript-sdk (generic), @modelcontextprotocol/sdk (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 20, 2026Updated Oct 20, 2026Source checked Oct 20, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps modelcontextprotocol/typescript-sdk (generic), @modelcontextprotocol/sdk (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
modelcontextprotocol/typescript-sdkgeneric	>=1.24.0 <1.32.0	1.32.0
@modelcontextprotocol/sdknpm	>=1.24.0,<1.32.0	1.32.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for modelcontextprotocol/typescript-sdk, @modelcontextprotocol/sdk.
Review the reported fix. Update modelcontextprotocol/typescript-sdk to 1.32.0; @modelcontextprotocol/sdk to 1.32.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 20, 2026

Sources and claim methodology

Upstream source description

MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.24.0 to before version 1.32.0, the experimental tasks feature (taskStore) did not check which session created a task. Clients sharing one InMemoryTaskStore could list, read and cancel each other's tasks. This issue has been patched in version 1.32.0.

Quoted source text, attributed separately from HOL analysis.