CVE-2026-123783

Skyvern through 1.0.56 Script Sandbox Bypass via types.CodeType Bytecode

Published Nov 6, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Skyvern-ai
Skyvern-ai skyvern
Vendors & Products Skyvern-ai
Skyvern-ai skyvern
Type Values Removed Values Added
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.
Title Skyvern through 1.0.56 Script Sandbox Bypass via types.CodeType Bytecode
Weaknesses CWE-184
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 6, 2026, 5:28 PM
Reserved
Nov 6, 2026, 2:37 PM
Status
Deferred
Published
Nov 6, 2026, 3:17 PM
Modified
Nov 6, 2026, 6:18 PM