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Tool Directory

CVE-2026-35580

CriticalPublished

Emissary has GitHub Actions Shell Injection via Workflow Inputs

Published: Apr 7, 2026
Updated: Apr 7, 2026
Assigning CNA: GitHub_M
Evidence observed: Sep 5, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 45.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Emissary is a P2P based data-driven workflow engine. Prior to 8.39.0, GitHub Actions workflow files contained shell injection points where user-controlled workflow_dispatch inputs were interpolated directly into shell commands via ${{ }} expression syntax. An attacker with repository write access could inject arbitrary shell commands, leading to repository poisoning and supply chain compromise affecting all downstream users. This vulnerability is fixed in 8.39.0.

Sources

gha-lab-ed7a1740c4Research
Security-research lab: controlled reproduction of GHSA-3g6g-gq4r-xjm9 / CVE-2026-35580 (GitHub Actions workflow_dispatch input shell injection) against a pinned snapshot of NationalSecurityAgency/emissary

Responsible use

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