Vulnerability · Published Mar 26, 2026 · Assigned by GitHub_M

CVE-2026-33491Zen-C has Stack-Based Buffer Overflow in Identifier Mangling

High 7.8

In plain English

A high-severity stack buffer overflow in zenc from zenc-lang. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)0.2%top 84.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
zenc-lang	zenc	< 0.4.4

Weakness: CWE-121, CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

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