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CVE-2026-123783— Skyvern through 1.0.56 Script Sandbox Bypass via types.CodeType Bytecode

Quick assessment

Affected
Skyvern-AI skyvern
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Skyvern 1.0.56 及更早版本存在沙箱绕过漏洞。该漏洞允许已认证用户通过利用 从原始字节码重构函数来执行代码。攻击者可部署能够规避 AST 拒绝列表的脚本，并导入被禁止的模块（如 或 ），从而在 Skyvern 服务器进程中执行恶意代码。

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Skyvern-AI skyvern ≤ 1.0.56 affected
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I. Basic Information for CVE-2026-123783

Vulnerability Information
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Vulnerability Title
Skyvern through 1.0.56 Script Sandbox Bypass via types.CodeType Bytecode
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Skyvern-AI skyvern 0 ~ 1.0.56 -

II. Public POCs for CVE-2026-123783

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III. Intelligence Information for CVE-2026-123783

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Other References for CVE-2026-123783 (6)

IV. Related Vulnerabilities

Same product: skyvern
Same vendor: Skyvern-AI
Same weakness: CWE-184