CVE-2026-123783
Skyvern through 1.0.56 Script Sandbox Bypass via types.CodeType Bytecode
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-184 |
| Vendor | skyvern-ai |
| Product | skyvern |
| Published | Nov 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Skyvern-AI / skyvern
0 ≤ 1.0.56
References
github.com: https://github.com/Skyvern-AI/skyvern/issues/8927 github.com: https://github.com/Skyvern-AI/skyvern github.com: https://github.com/Skyvern-AI/skyvern/pull/8937 github.com: https://github.com/Skyvern-AI/skyvern/commit/31a64c1a4b5dfaf1e76a7164845e10f2d68248dc github.com: https://github.com/Skyvern-AI/skyvern/blob/v1.0.56/skyvern/forge/sdk/workflow/code_block_safety.py#L106-L142 github.com: https://github.com/Skyvern-AI/skyvern/blob/v1.0.56/skyvern/forge/sdk/workflow/service.py#L1509-L1511 vulncheck.com: https://www.vulncheck.com/advisories/skyvern-through-1.0.56-script-sandbox-bypass-via-types-codetype-bytecode
Credits
George Chen Aaron Perez