CVE-2026-82447 Skyvern-AI CVE debrief

Who should care

Defenders responsible for Skyvern deployments, especially those processing untrusted input, should assess exposure and prioritize patching or mitigation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure that Skyvern is properly secured and monitored for suspicious activity.

Why it matters

CVE-2026-82447 is a high-severity vulnerability in Skyvern that allows for sandbox escape and potential arbitrary code execution. Defenders should prioritize patching or mitigating this vulnerability, especially in environments where untrusted input is processed by Skyvern.

• Potential for arbitrary code execution with server process privileges
• Possible lateral movement within compromised environments
• Need for input validation and sanitization to prevent malicious Jinja template syntax injection
• Requirement for patching or mitigating the vulnerability to prevent exploitation

Technical summary

The vulnerability exists in the TextPromptBlock component of Skyvern, which renders prompts twice: once through a sandboxed Jinja environment and then through an unsandboxed environment. This allows attackers to inject malicious Jinja template syntax, potentially leading to arbitrary code execution with server process privileges. The vulnerability is particularly concerning in environments where untrusted input is processed by Skyvern, as it could lead to lateral movement within compromised environments. Defenders should prioritize patching or mitigating this vulnerability.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where untrusted input is processed by Skyvern.

Recommended defensive actions

• Patch Skyvern to version 1.0.45 or later
• Restrict input to TextPromptBlock to prevent malicious Jinja template syntax injection
• Monitor for suspicious activity in Skyvern workflows
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is described in the CVE record and NVD entry. The source references provide additional context, including code snippets and commit history. Evidence is limited to public CVE and NVD data. Defenders should verify the vulnerability's existence and scope within their environments, focusing on input validation and sanitization to prevent malicious Jinja template syntax injection.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.