CVE-2026-55609 sublinear-time-solver: Arbitrary file write in consciousness-explorer / sublinear-time-solver MCP export_state
An attacker can read, write, or overwrite arbitrary files via path traversal in MCP export/import tools, compromising confidentiality and integrity.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55609?
CVE-2026-55609 is a high-severity path traversal vulnerability in ruvnet sublinear-time-solver, published on 25 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
sublinear-time-solver is a Rust and WebAssembly library for solving asymmetric diagonally dominant systems in sublinear time. Prior to consciousness-explorer 1.1.2 and sublinear-time-solver 1.6.0, the export_state and import_state tools in src/consciousness-explorer/mcp/server.js pass the attacker-controlled filepath parameter to filesystem operations in src/consciousness-explorer/index.js without restricting the destination or rejecting traversal. The saveVectorToFile and loadVectorFromFile tools in src/mcp/server.ts contain the same sink class through the file_path parameter. An attacker able to invoke the MCP tools can read, write, or overwrite any file accessible to the server process, causing confidentiality and integrity loss and possible service disruption. This issue is fixed in consciousness-explorer 1.1.2 and sublinear-time-solver 1.6.0.
Weakness: CWE-73
Which versions are affected by CVE-2026-55609?
4 open source packages ship an affected version, including sublinear-time-solver and consciousness-explorer.
| Package | Affected | Fixed in |
|---|---|---|
sublinear-time-solver npm | All versions | 1.6.0 |
sublinear-time-solver npm | All versions | 1.6.0 |
consciousness-explorer npm | All versions | 1.1.2 |
consciousness-explorer npm | All versions | 1.1.2 |
How do I fix CVE-2026-55609?
Upgrade sublinear-time-solver to 1.6.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-55609 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55609 exists.
Sources
Also known as GHSA-xc9g-j69q-37xw.