{"id":207258,"date":"2026-01-27T11:45:00","date_gmt":"2026-01-27T16:45:00","guid":{"rendered":"https:\/\/news-you-need.com\/index.php\/2026\/01\/27\/pyodide-sandbox-escape-enables-remote-code-execution-in-grist-core\/"},"modified":"2026-01-28T05:10:09","modified_gmt":"2026-01-28T10:10:09","slug":"pyodide-sandbox-escape-enables-remote-code-execution-in-grist-core","status":"publish","type":"post","link":"https:\/\/news-you-need.com\/index.php\/2026\/01\/27\/pyodide-sandbox-escape-enables-remote-code-execution-in-grist-core\/","title":{"rendered":"Pyodide Sandbox Escape Enables Remote Code Execution in Grist-Core"},"content":{"rendered":"

Pyodide Sandbox Escape Enables Remote Code Execution in Grist-Core<\/a><\/p>\n

https:\/\/www.infosecurity-magazine.com\/news\/pyodide-sandbox-escape-rce-grist\/<\/a><\/p>\n

Publish Date: 2026-01-27 11:45:00<\/a><\/p>\n

Source Domain: www.infosecurity-magazine.com<\/a><\/p>\n

A critical sandbox escape vulnerability in Grist-Core has been disclosed that allows remote code execution (RCE) through a single malicious spreadsheet formula.<\/p>\n

The issue was uncovered by Cyera Research Labs and affects Grist\u2019s Python formula execution layer, where untrusted formulas are evaluated inside a Pyodide WebAssembly sandbox.<\/p>\n

The flaw has been assigned a CVSS score of 9.1 and has now been patched following coordinated disclosure with the Grist-Core security team.<\/p>\n

How Spreadsheet Data Became an Execution Vector<\/h2>\n

Grist-Core is a programmable alternative to Excel and Google Sheets, used to model data, automate workflows and build lightweight applications.<\/p>\n

It is deployed both as a managed software-as-a-service (SaaS) offering and in self-hosted environments, placing it close to customer records, credentials and operational systems. That positioning significantly increases the impact of any failure in execution isolation.<\/p>\n

The vulnerability allows a formula author to escape the Pyodide sandbox and execute operating system commands or JavaScript in the host runtime. Cyera Research Labs demonstrated that Python\u2019s object model, combined with the availability of ctypes and exposed Emscripten runtime hooks, enables traversal paths that should not be reachable from a spreadsheet cell. As a result, routine data processing becomes an execution surface.<\/p>\n

This approach is notable because it does not resemble traditional injection attacks. The exploit is delivered as legitimate spreadsheet content and follows the same data-processing paths Grist uses to evaluate formulas. Once the boundary collapses, the spreadsheet ceases to be a passive document and instead acts as a beachhead for host-level compromise.<\/p>\n

Read more on malicious documents: TamperedChef Malvertising Campaign Drops Malware via Fake PDF Manuals<\/p>\n

Why the SaaS Blast Radius Matters<\/h2>\n

The risk extends beyond individual servers. In managed SaaS deployments, formula execution occurs inside…<\/p>\n

Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Pyodide Sandbox Escape Enables Remote Code Execution in Grist-Core https:\/\/www.infosecurity-magazine.com\/news\/pyodide-sandbox-escape-rce-grist\/ Publish Date: 2026-01-27 11:45:00 Source…<\/p>\n","protected":false},"author":1,"featured_media":207259,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/assets.infosecurity-magazine.com\/webpage\/og\/4869d8b3-6473-4a00-a59d-0c26dce2ab64.jpg","fifu_image_alt":"","footnotes":""},"categories":[15],"tags":[31,32,27],"class_list":["post-207258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity","tag-exploit","tag-malware","tag-vulnerability"],"_links":{"self":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/207258"}],"collection":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/comments?post=207258"}],"version-history":[{"count":1,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/207258\/revisions"}],"predecessor-version":[{"id":207260,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/207258\/revisions\/207260"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media\/207259"}],"wp:attachment":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media?parent=207258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/categories?post=207258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/tags?post=207258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}