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

CVE-2026-40200 is fixed in musl on 1 platform, first by DEBIAN-CVE-2026-40200, released April 10, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-40200
- Priority: High
- CVSS: 8.1 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 10, 2026

## 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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | musl Debian 13.5 (trixie) | 1.2.5-3.1~deb13u1 | [DEBIAN-CVE-2026-40200](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40200.md) | Apr 10, 2026 |
| Linux | musl Debian 14 | 1.2.5-3.1 | [DEBIAN-CVE-2026-40200](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40200.md) | Apr 10, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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