CVE-2026-33491: Zen C is a systems programming language that compiles to human-readable GNU C/C11

Q: How do I fix CVE-2026-33491?

zen c: upgrade to 0.4.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-33491 being exploited?

CVE-2026-33491 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33491 affect?

CVE-2026-33491 affects zen c. Severity is high (CVSS 7.8). 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 a

Q: How urgent is CVE-2026-33491?

Priority 36/100. High severity; Public exploit reference

Routine

HIGH 7.8UPGRADE

CVE-2026-33491 is a high-severity flaw (CVSS 7.8) affecting zen c. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 p

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: zenc-lang

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 19:17 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

zenc-lang zen c UPGRADE

Affected: < 0.4.4

Fixed in: 0.4.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zen-c || rpm -q zen-c || zen-c --version

2. UPGRADE to 0.4.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zen-c

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zen-c

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33491?

zen c: upgrade to 0.4.4. Exact commands for each OS are on this page.

Is CVE-2026-33491 being exploited?

CVE-2026-33491 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33491 affect?

CVE-2026-33491 affects zen c. Severity is high (CVSS 7.8). 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 a

How urgent is CVE-2026-33491?

Priority 36/100. High severity; Public exploit reference

References

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