CVE-2024-41127: Monkeytype

Critical severity, CVSS 9.6. EPSS: 0.9% chance of exploitation in the next 30 days.

Monkeytype is a minimalistic and customizable typing test. Monkeytype is vulnerable to Poisoned Pipeline Execution through Code Injection in its ci-failure-comment.yml GitHub Workflow, enabling attackers to gain pull-requests write access. The ci-failure-comment.yml workflow is triggered when the Monkey CI workflow completes. When it runs, it will download an artifact uploaded by the triggering workflow and assign the contents of ./pr_num/pr_num.txt artifact to the steps.pr_num_reader.outputs.content WorkFlow variable. It is not validated that the variable is actually a number and later it is interpolated into a JS script allowing an attacker to change the code to be executed. This issue leads to pull-requests write access. This vulnerability is fixed in 24.30.0.

Affected products

• Monkeytype Monkeytype: before 24.30.0 (fixed in 24.30.0)

Published 2024-08-02. Last modified 2026-06-17.