What’s Vulnerable › Vulnerabilities

CVE-2025-22153: try/except* clauses could allow bypass RestrictedPython via type confusion bug in the CPython interpreter

• Severity: high (CVSS 7.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-23 · updated 2026-06-17
• Weakness: CWE-843

Description

RestrictedPython is a tool that helps to define a subset of the Python language which allows to provide a program input into a trusted environment. Via a type confusion bug in versions of the CPython interpreter starting in 3.11 and prior to 3.13.2 when using `try/except*`, RestrictedPython starting in version 6.0 and prior to version 8.0 could be bypassed. The issue is patched in version 8.0 of RestrictedPython by removing support for `try/except*` clauses. No known workarounds are available.

Affected products

• zopefoundation RestrictedPython: from 6.0, < 8.0

References

• https://github.com/zopefoundation/RestrictedPython/commit/48a92c5bb617a647cffd0dadd4d5cfe626bcdb2f
• https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-gmj9-h825-chq2

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