What is CVE-2026-40200?

CVE-2026-40200 is a high-severity vulnerability in Musl-libc Musl, classified under Always-Incorrect Control Flow Implementation. CVSS score: 8.1/10. Published 2026-04-10.

How severe is CVE-2026-40200?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Musl-libc Musl

CVE-2026-40200

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 mil…

EPSS: 0.000 (5.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Musl-libc Musl — versions 0.7.10

Weakness classification (CWE)

CWE-670 — Always-Incorrect Control Flow Implementation

References

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

Frequently asked questions

What is CVE-2026-40200?: CVE-2026-40200 is a high-severity vulnerability in Musl-libc Musl, classified under Always-Incorrect Control Flow Implementation. CVSS score: 8.1/10. Published 2026-04-10.
How severe is CVE-2026-40200?: High severity. CVSS v3 base score is 8.1 out of 10.