CVE-2026-35580
Emissary has GitHub Actions Shell Injection via Workflow Inputs
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-77 |
| Vendor | nationalsecurityagency |
| Product | emissary |
| Published | Apr 7, 2026 |
| Last Updated | Apr 7, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
NationalSecurityAgency / emissary
< 8.39.0