CVE-2026-33491

Zen-C has Stack-Based Buffer Overflow in Identifier Mangling

State: Published
Severity: 7.8 High
Published: Mar 26, 2026
Updated: Mar 27, 2026
Reserved: Mar 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-121 Stack-based Buffer Overflow
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
zenczenc-lang	< 0.4.4Affected

References

https://github.com/zenc-lang/zenc/security/advisories/GHSA-rv74-w6q7-h8xr

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