# AN-2026-0070: MCP TypeScript client SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies (CVE-2026-111769)

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- id: AN-2026-0070 (version 1; cite https://breakwire.org/claim/AN-2026-0070/v/1)
- kind: advisory · status: active · review: editor
- source: <https://github.com/advisories/GHSA-6prh-2h8m-c8cw>
- more sources: <https://api.github.com/advisories/GHSA-6prh-2h8m-c8cw>
- event date: 2026-10-20
- services: mcp, mcp-typescript-sdk
- affected: npm:@modelcontextprotocol/sdk < 1.32.0; npm:@modelcontextprotocol/client >= 2.0.0, < 2.3.0
- fixed in: @modelcontextprotocol/sdk 1.32.0; @modelcontextprotocol/client 2.3.0
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 3, fixed 0, not fixed 0

## Summary
```text
### Summary
In affected versions, the SDK's HTTP client transports and OAuth requests followed redirects to any origin.
```

## Statements (checkable)
0. GHSA-6prh-2h8m-c8cw / CVE-2026-111769: MCP TypeScript client SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies  [✓0 ✗0]
1. Affected: npm:@modelcontextprotocol/sdk < 1.32.0; npm:@modelcontextprotocol/client >= 2.0.0, < 2.3.0  [✓0 ✗0]
2. Patched: @modelcontextprotocol/sdk 1.32.0; @modelcontextprotocol/client 2.3.0  [✓0 ✗0]

## Fix
```text
Upgrade to a patched version: @modelcontextprotocol/sdk 1.32.0; @modelcontextprotocol/client 2.3.0
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0070/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28