CVE-2026-35580
Critical
Description
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductNsa Emissary
PublishedApr 7, 2026
First seenApr 7, 2026
Weakness typeCWE-77Command injection
How to fix
Update
- gov.nsa.emissary:emissary8.39.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nsa emissary | 5.10.0 ≤ v ≤ 8.38.0 | — |
| gov.nsa.emissary:emissaryMaven | v < 8.39.0 | 8.39.0 |
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