CVE-2026-33491: Zenc-Lang Zen C

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Zen C is a systems programming language that compiles to human-readable GNU C/C11. Prior to version 0.4.4, a stack-based buffer overflow vulnerability in the Zen C compiler allows attackers to cause a compiler crash or potentially execute arbitrary code by providing a specially crafted Zen C source file (`.zc`) with excessively long struct, function, or trait identifiers. Users are advised to update to Zen C version v0.4.4 or later to receive a patch.

Affected products

• Zenc-Lang Zen C: before 0.4.4 (fixed in 0.4.4)

Published 2026-03-26. Last modified 2026-06-17.