Is this vulnerability remotely exploitable?

It is indirectly exploitable: an attacker must convince a victim to open a crafted file in Vim. There is no remote network exploit in Vim itself, but any channel that delivers files—such as email, version control, or downloads—can become a delivery vector.

What level of access does an attacker need to exploit this issue?

The attacker only needs the ability to provide or modify a file the victim will open with Vim; no local shell on the victim's machine is required. Once the victim opens the file, the embedded modelines and expressions can trigger the exploit.

What is the safest general fix pattern for this kind of problem?

The safest approach is to ensure that features allowing files to influence editor behavior—like modelines, mappings, and embedded expressions—are tightly constrained or disabled for untrusted content. All code paths that change mappings, run commands, or interact with the OS should be guarded by explicit security checks that are enforced in secure or sandboxed modes.

Severity:

HIGH RISK

(8.2)

OS Command Injection via Modeline Sandbox Bypass (CWE-78) in Vim

CVE-2026-34982

Published:

Apr 6, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Arbitrary OS Command Execution on the User's Machine

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Arbitrary OS Command Execution on the User's Machine

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

OS Command Injection via Modeline Sandbox Bypass (CWE-78) in Vim

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare