What is CVE-2024-41127?

CVE-2024-41127 is a high-severity vulnerability in Monkeytype, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.3/10. Published 2024-08-02.

How severe is CVE-2024-41127?

High severity. CVSS v3 base score is 8.3 out of 10.

Is CVE-2024-41127 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Monkeytype

CVE-2024-41127

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.

Published 2024-08-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.5th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Monkeytype
Monkeytypegame Monkeytype — versions < 24.30.0

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/monkeytypegame/monkeytype/security/advisories/GHSA-wcjf-5464-4wq9 (Vendor Advisory)
github.com/monkeytypegame/monkeytype/commit/29627fd0d5f152e2da59671987090ea0a5c… (Patch)
securitylab.github.com/advisories/GHSL-2024-167_monkeytype (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2024-41127?: CVE-2024-41127 is a high-severity vulnerability in Monkeytype, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.3/10. Published 2024-08-02.
How severe is CVE-2024-41127?: High severity. CVSS v3 base score is 8.3 out of 10.
Is CVE-2024-41127 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.