VDB-348272 · CVE-2026-3386 · EUVD-2026-9121

wren-lang wren up to 0.4.0 src/vm/wren_compiler.c emitOp out-of-bounds

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.5	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in wren-lang wren up to 0.4.0. Affected by this issue is the function emitOp of the file src/vm/wren_compiler.c. Such manipulation leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2026-3386. Local access is required to approach this attack. Moreover, an exploit is present. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability was found in wren-lang wren up to 0.4.0. It has been rated as problematic. Affected by this issue is the function emitOp of the file src/vm/wren_compiler.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-3386. The exploitation is known to be easy. The attack needs to be approached locally. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202603-012) and EUVD (EUVD-2026-9121). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

wren-lang

Name

wren

Version

Website

Product: https://github.com/wren-lang/wren/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔒

CNA Base Score: 3.3
CNA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/28/2026 Advisory disclosed
02/28/2026 +0 days VulDB entry created
03/05/2026 +5 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Not defined

CVE: CVE-2026-3386 (🔒)
GCVE (CVE): GCVE-0-2026-3386
GCVE (VulDB): GCVE-100-348272
EUVD: 🔒
CNNVD: CNNVD-202603-012 - wren 缓冲区错误漏洞

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/28/2026 15:55
Updated: 03/05/2026 03:02
Changes: 02/28/2026 15:55 (56), 03/01/2026 19:27 (30), 03/01/2026 21:10 (1), 03/02/2026 17:13 (6), 03/03/2026 22:45 (1), 03/05/2026 03:02 (11)
Complete: 🔍
Submitter: Oneafter
Cache ID: 216:4E5:103

Submitinfo

Accepted

Submit #761306: wren-lang wren main-branch Buffer Overflow (by Oneafter)

VulDB is the best source for vulnerability data and more expert information about this specific topic.