PT-2026-26794 · Zen C · Zen-C

Thesmartshadow · Published 2026-03-20 · Updated 2026-05-01 · CVE-2026-33491

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Zen C versions prior to 0.4.4

Description A stack-based buffer overflow exists in the Zen C compiler. This issue is due to a flaw in identifier mangling. By supplying a specially crafted Zen C source file (.zc) containing excessively long struct, function, or trait identifiers, an attacker can cause a compiler crash or potentially execute arbitrary code. The vulnerability affects the processing of identifiers within the compiler.

Recommendations Update to Zen C version 0.4.4 or later.

Exploit

Fix

Stack Overflow

Memory Corruption

Weakness Enumeration

CWE-121

CWE-787

Related Identifiers

CVE-2026-33491

GHSA-RV74-W6Q7-H8XR

Affected Products

Zen-C

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33491.json · Exploit
• https://github.com/zenc-lang/zenc/security/advisories/GHSA-rv74-w6q7-h8xr · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33491 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33491 · Security Note
• https://twitter.com/CVEnew/status/2037280596607881615 · Twitter Post
• https://twitter.com/zuhaitz_dev/status/2035057621070213498 · Twitter Post
• https://twitter.com/cyberbivash/status/2037248522005696980 · Twitter Post
• https://t.me/cveNotify/161732 · Telegram Post