What’s Vulnerable › Vulnerabilities

CVE-2026-24002: pyodide sandbox option is insecure

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-22 · updated 2026-06-17
• Weakness: CWE-74

Description

Grist is spreadsheet software using Python as its formula language. Grist offers several methods for running those formulas in a sandbox, for cases where the user may be working with untrusted spreadsheets. One such method runs them in pyodide, but pyodide on node does not have a useful sandbox barrier. If a user of Grist sets `GRIST_SANDBOX_FLAVOR` to `pyodide` and opens a malicious document, that document could run arbitrary processes on the server hosting Grist. The problem has been addressed in Grist version 1.7.9 and up, by running pyodide under deno. As a workaround, a user can use the gvisor-based sandbox by setting `GRIST_SANDBOX_FLAVOR` to `gvisor`.

Affected products

• gristlabs grist-core: before 1.7.9 — fixed in 1.7.9

How to fix

Upgrade to a fixed version: gristlabs grist-core 1.7.9. Check the vendor advisory for mitigations.

References

• https://github.com/gristlabs/grist-core/security/advisories/GHSA-7xvx-8pf2-pv5g
• https://support.getgrist.com/self-managed/#how-do-i-sandbox-documents

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