High severity8.8NVD Advisory· Published Nov 6, 2026· Updated Nov 6, 2026
CVE-2026-123783
CVE-2026-123783
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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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=1.0.56
Patches
Vulnerability mechanics
References
6- github.com/Skyvern-AI/skyvern/blob/v1.0.56/skyvern/forge/sdk/workflow/code_block_safety.pynvd
- github.com/Skyvern-AI/skyvern/blob/v1.0.56/skyvern/forge/sdk/workflow/service.pynvd
- github.com/Skyvern-AI/skyvern/commit/31a64c1a4b5dfaf1e76a7164845e10f2d68248dcnvd
- github.com/Skyvern-AI/skyvern/issues/8927nvd
- github.com/Skyvern-AI/skyvern/pull/8937nvd
- www.vulncheck.com/advisories/skyvern-through-1.0.56-script-sandbox-bypass-via-types-codetype-bytecodenvd
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