Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nsa | Emissary | >= 5.10.0, <= 8.38.0 |
Related Weaknesses (CWE)
References
- https://github.com/NationalSecurityAgency/emissary/pull/1286Patch
- https://github.com/NationalSecurityAgency/emissary/pull/1288Patch
- https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-3g6gExploitVendor Advisory
FAQ
What is CVE-2026-35580?
CVE-2026-35580 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 di...
How severe is CVE-2026-35580?
CVE-2026-35580 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-35580?
Check the references section above for vendor advisories and patch information. Affected products include: Nsa Emissary.