NULL pointer dereference in Wren
CVE-2026-3387
A vulnerability has been found in wren-lang wren up to 0.4.0. Affected by this issue is the function getByteCountForArguments of the file src/vm/wren_compiler.c. Such manipulation leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
EPSS: 0.002 (5.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Wren
- Wren-lang Wren — versions 0.1, 0.2, 0.3
Weakness classification (CWE)
References
- cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
- cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
- cna@vuldb.com (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
- cna@vuldb.com (Exploit, exploit)
- cna@vuldb.com (Product, product)
Frequently asked questions
- What is CVE-2026-3387?
- CVE-2026-3387 is a low-severity vulnerability in Wren, classified under Improper Resource Shutdown or Release. CVSS score: 3.3/10. Published 2026-03-01.
- How severe is CVE-2026-3387?
- Low severity. CVSS v3 base score is 3.3 out of 10.