What is CVE-2026-33491?

CVE-2026-33491 is a high-severity vulnerability in Zenc-Lang Zen C, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-03-26.

How severe is CVE-2026-33491?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Zenc-Lang Zen C

CVE-2026-33491

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.

Vulnerability class: Buffer Overflow

Published 2026-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (8.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

Zenc-Lang Zen C
Zenc-Lang Zenc — versions < 0.4.4

Weakness classification (CWE)

References

github.com/zenc-lang/zenc/security/advisories/GHSA-rv74-w6q7-h8xr (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33491?: CVE-2026-33491 is a high-severity vulnerability in Zenc-Lang Zen C, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-03-26.
How severe is CVE-2026-33491?: High severity. CVSS v3 base score is 7.8 out of 10.