EUVD-2026-21496
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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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).
Analysis
Stack-based buffer overflow in musl libc 0.7.10 through 1.2.6 allows local attackers with high complexity requirements to corrupt memory during qsort operations on exceptionally large arrays (exceeding ~7 million elements on 32-bit systems, corresponding to the 32nd Leonardo number). Exploitation requires sorting arrays approaching billion-element scale on 64-bit platforms. …
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Remediation
Within 24 hours: Inventory all systems and containers running musl libc versions 0.7.10-1.2.6 (check `ldd --version` or `musl-libc --version`; identify Alpine Linux, BusyBox-based images, and embedded Linux deployments). Within 7 days: Evaluate whether applications in your environment process qsort operations on arrays exceeding 7 million elements (32-bit) or approaching 1 billion elements (64-bit); document findings in your asset inventory. …
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