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High severity · published Apr 10, 2026
CVE-2026-40200
An issue was discovered in musl libc 0.7.10 through 1.2.6
8.1
CVSS
0.2%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MU
musl · musl-libc
0.7.10 through 1.2.6 · source: vendor
Affected product
MU
musl
musl-libc
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40200
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40200
musl.libc.org
https://musl.libc.org/releases.html
www.openwall.com
https://www.openwall.com/lists/oss-security/2026/04/10/13
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/04/10/13
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