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CVE-2026-40200 is a stack-based memory corruption vulnerability in musl libc affecting versions 0.7.10 through 1.2.6. The flaw occurs during qsort operations on extremely large arrays because musl's double-word primitives were incorrectly implemented. When the element count exceeds a platform-dependent threshold tied to Leonardo numbers, qsort can corrupt stack memory. The issue is practically reachable on 32-bit platforms at slightly more than about seven million elements, corresponding to the 32nd Leonardo number. On 64-bit platforms, the equivalent threshold is the 64th Leonardo number, which is considered impractical to reach in real-world conditions.
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A vulnerability in musl addressed by backported patches in OpenWrt 25.12.5.
A security vulnerability in musl libc for which upstream fixes were backported; no further details are provided in the content.
A musl libc vulnerability causing stack corruption in qsort with sufficiently large inputs.
A specific vulnerability in musl addressed in Alpine Linux stable releases 3.20.10, 3.21.7, 3.22.4, and 3.23.4.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.