Skyvern-AI Skyvern up to 1.0.56 AST Denylist sandbox

Summaryinfo

A vulnerability was found in Skyvern-AI Skyvern up to 1.0.56 and classified as critical. Affected by this issue is some unknown functionality of the component AST Denylist. Such manipulation leads to sandbox. This vulnerability is referenced as CVE-2026-123783. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Skyvern-AI Skyvern up to 1.0.56 and classified as critical. Affected by this issue is an unknown code of the component AST Denylist. The manipulation with an unknown input leads to a sandbox vulnerability. Using CWE to declare the problem leads to CWE-265. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-123783 since 11/06/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/06/2026). The MITRE ATT&CK project declares the attack technique as T1611.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Skyvern-AI

Name

• Skyvern

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18
• 1.0.19
• 1.0.20
• 1.0.21
• 1.0.22
• 1.0.23
• 1.0.24
• 1.0.25
• 1.0.26
• 1.0.27
• 1.0.28
• 1.0.29
• 1.0.30
• 1.0.31
• 1.0.32
• 1.0.33
• 1.0.34
• 1.0.35
• 1.0.36
• 1.0.37
• 1.0.38
• 1.0.39
• 1.0.40
• 1.0.41
• 1.0.42
• 1.0.43
• 1.0.44
• 1.0.45
• 1.0.46
• 1.0.47
• 1.0.48
• 1.0.49
• 1.0.50
• 1.0.51
• 1.0.52
• 1.0.53
• 1.0.54
• 1.0.55
• 1.0.56

Website

• Product: https://github.com/Skyvern-AI/skyvern/

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