CVE-2026-1977Public exploitNetwork attack vector

Authenticated code execution via eval of chart specification

Published Feb 6, 2026 · Updated Feb 6, 2026

Code injection in Isaac Wasserman mcp-vegalite-server allows remote authenticated users to execute code through visualize_data. The visualize_data tool passes its vegalite_specification string to Python eval(), so expressions can import modules and run operating-system commands. Access to invoke the MCP tool is required, and injected code runs with the server process's privileges or within its sandbox when isolation is present.

CVSS severity6.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Isaac Wasserman mcp-vegalite-server allows remote authenticated users to execute code through visualize_data. The visualize_data tool passes its vegalite_specification string to Python eval(), so expressions can import modules and run operating-system commands. Access to invoke the MCP tool is required, and injected code runs with the server process's privileges or within its sandbox when isolation is present.

The record

CVE
CVE-2026-1977
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Isaac Wasserman
Product
mcp-vegalite-server
Classifications
CWE-74, CWE-94, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16aefed598b8cd897b78e99b907f6e2984572c61

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Isaac Wasserman · mcp-vegalite-serverversion=16aefed598b8cd897b78e99b907f6e2984572c61

Published CVSS scores

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.006Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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