EUVD-2026-80780Severity by source
AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
AC:H because exploitation depends on a non-default host config exposing Formatter; PR:L as the attacker must be able to submit restricted code; UI:N (no victim action); S:C and full triad for host-environment code execution.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
RestrictedPython is a tool that helps define a subset of the Python language for accepting program input in a trusted environment. Prior to 8.4, RestrictedPython could allow a sandbox escape when a custom import policy or globals exposed the standard library string module, the string.Formatter class, a Formatter instance, or a Formatter subclass to restricted code. The string.Formatter methods format, get_field, get_value, and vformat performed attribute and item traversal internally without passing through RestrictedPython's safer_getattr protections. Restricted code could use those live object references to reach function globals, builtins, file access, or code execution primitives, affecting confidentiality, integrity, and availability in the host environment. This issue is fixed in version 8.4.
AnalysisAI
Sandbox escape in RestrictedPython versions prior to 8.4 lets code executing inside the restricted context reach host-level primitives - function globals, builtins, file access, and code-execution gadgets - whenever the host exposes the standard-library string module, the string.Formatter class, a Formatter instance, or a Formatter subclass to that restricted code. The prerequisite is non-default: stock RestrictedPython does not surface these objects, so a custom import policy or specially crafted globals must be in place, and the attacker must also be able to submit restricted Python code (typically an authenticated user of the hosting application). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the host application to expose to restricted code one of: the standard-library string module, the string.Formatter class, a Formatter instance, or a Formatter subclass - supplied either through a custom import policy or via the globals passed to restricted execution. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 8.4 (vendor vector AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H), reflecting a sandbox escape from RestrictedPython's restricted execution context into the host environment with full confidentiality, integrity, and availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to RestrictedPython 8.4, the vendor-released patch that fixes this issue; the relevant change is commit 3b47440070b91f8807c2b2998aca99e94783639a, which blocks import of string.Formatter and raises NotImplementedError from safer_getattr for the format, get_field, get_value, and vformat methods on Formatter instances, the Formatter class, and Formatter subclasses. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every application that depends on RestrictedPython, record the deployed version, and flag any deployment whose custom import policy or globals expose the standard-library string module, the string.Formatter class, a Formatter instance, or a Formatter subclass to restricted code; treat those flagged systems as the immediate priority and restrict who can submit restricted Python code in the meantime. …
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