CVE-2026-82447
Received Received - Intake

Sandbox Escape in Skyvern via Malicious Jinja Template Injection

Publication date: 2026-08-29

Last updated on: 2026-08-29

Assigner: VulnCheck

Description
Skyvern before 1.0.45 contains a sandbox escape vulnerability in TextPromptBlock that renders prompts twice, first through a sandboxed Jinja environment and then through an unsandboxed environment. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server process privileges.

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Meta Information

Published
2026-08-29
Last Modified
2026-08-29
Generated
2026-08-29
AI Q&A
2026-08-29
EPSS Evaluated
N/A
NVD
CVE-2026-82447
EUVD
EUVD-2026-68096

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
skyvern-ai skyvern to 1.0.45 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-1336 The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.

Attack-Flow Graph

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Executive Summary

Skyvern before version 1.0.45 has a sandbox escape vulnerability in the TextPromptBlock component. It renders prompts twice: first in a sandboxed Jinja environment and then unsandboxed. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server privileges.

Detection Guidance

Check Skyvern version with pip show skyvern or grep version in installed files. Monitor for unexpected code execution in logs, especially from TextPromptBlock components. Look for double-rendered prompts in workflow execution traces.

Impact Analysis

This vulnerability allows attackers to execute arbitrary code on the server running Skyvern with the same privileges as the server process. This could lead to full system compromise, data theft, or unauthorized access to sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection principles and HIPAA's security requirements. Organizations using vulnerable Skyvern versions may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Upgrade Skyvern to version 1.0.45 or later. Review workflow parameters for malicious Jinja syntax like {{7*7}}. Disable TextPromptBlock usage until patched. Monitor for unauthorized server process activity.

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