Vulnerability · Published Mar 1, 2026 · Assigned by VulDB

CVE-2026-3386wren-lang wren wren_compiler.c emitOp out-of-bounds

Low 3.3

In plain English

A low-severity out-of-bounds read 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 90.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A flaw has been found in wren-lang wren up to 0.4.0. Affected by this vulnerability is the function emitOp of the file src/vm/wren_compiler.c. This manipulation causes out-of-bounds read. It is possible to launch the attack on the local host. The exploit has been published 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-125, CWE-119 · 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-348272 | wren-lang wren wren_compiler.c emitOp out-of-bounds vdb-entry, technical-description
VDB-348272 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #761306 | wren-lang wren main-branch Buffer Overflow third-party-advisory
https://github.com/wren-lang/wren/issues/1219 issue-tracking
https://github.com/oneafter/0122/blob/main/i1219/repro exploit
https://github.com/wren-lang/wren/ product