Advisories

Skyvern through 1.0.56 Script Sandbox Bypass via types.CodeType Bytecode

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Severity
high
Date
Affecting
  • skyvern <= 1.0.56

CWE
  • CWE-184 Incomplete List of Disallowed Inputs
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
George Chen, Aaron Perez
Description
Skyvern through 1.0.56 contains a sandbox bypass vulnerability that allows authenticated users to execute code by reconstructing functions from raw bytecode with types.CodeType. Attackers can deploy scripts that evade the is_safe_script_code AST denylist and import blocked modules such as subprocess or socket to run code in the Skyvern server process.

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