Vulnerability · Published Mar 1, 2026 · Assigned by VulDB

CVE-2026-3387wren-lang wren wren_compiler.c getByteCountForArguments null pointer dereference

Low 3.3

In plain English

A low-severity null pointer dereference in wren from wren-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 9% of all known vulnerabilities).

Severity (CVSS 3.1)3.3Low

Exploit odds (30 days)0.2%top 91.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
wren-lang	wren	0.10.20.30.4.0

Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

References

VDB-348273 | wren-lang wren wren_compiler.c getByteCountForArguments null pointer dereference vdb-entry, technical-description
VDB-348273 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #761312 | wren-lang wren main-branch NULL Pointer Dereference third-party-advisory
https://github.com/wren-lang/wren/issues/1220 issue-tracking
https://github.com/oneafter/0122/blob/main/i1220/repro exploit
https://github.com/wren-lang/wren/ product