CVE-2026-2858
wren-lang wren Source File wren_compiler.c peekChar out-of-bounds
Description
A vulnerability was identified in wren-lang wren up to 0.4.0. This affects the function peekChar of the file src/vm/wren_compiler.c of the component Source File Parser. Such manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.
INFO
Published Date :
Feb. 20, 2026, 10:16 p.m.
Last Modified :
Feb. 26, 2026, 2:35 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update wren-lang to the latest stable version.
- Apply any available patches or security advisories.
- Monitor project for official fixes.
- Recompile the affected source code.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2858.
| URL | Resource |
|---|---|
| https://github.com/oneafter/0122/blob/main/i1217/repro | Issue Tracking Product |
| https://github.com/wren-lang/wren/ | Product |
| https://github.com/wren-lang/wren/issues/1217 | Issue Tracking |
| https://vuldb.com/?ctiid.347097 | Permissions Required VDB Entry |
| https://vuldb.com/?id.347097 | Third Party Advisory VDB Entry |
| https://vuldb.com/?submit.754489 | Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2858 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2858
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2858 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-2858 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 26, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:a:wren:wren:*:*:*:*:*:*:*:* versions up to (including) 0.4.0 Added Reference Type VulDB: https://github.com/oneafter/0122/blob/main/i1217/repro Types: Issue Tracking, Product Added Reference Type VulDB: https://github.com/wren-lang/wren/ Types: Product Added Reference Type VulDB: https://github.com/wren-lang/wren/issues/1217 Types: Issue Tracking Added Reference Type VulDB: https://vuldb.com/?ctiid.347097 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.347097 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.754489 Types: Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Feb. 20, 2026
Action Type Old Value New Value Added Description A vulnerability was identified in wren-lang wren up to 0.4.0. This affects the function peekChar of the file src/vm/wren_compiler.c of the component Source File Parser. Such manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Added CVSS V2 (AV:L/AC:L/Au:S/C:N/I:N/A:P) Added CWE CWE-119 Added CWE CWE-125 Added Reference https://github.com/oneafter/0122/blob/main/i1217/repro Added Reference https://github.com/wren-lang/wren/ Added Reference https://github.com/wren-lang/wren/issues/1217 Added Reference https://vuldb.com/?ctiid.347097 Added Reference https://vuldb.com/?id.347097 Added Reference https://vuldb.com/?submit.754489