CVE-2026-35580: critical vulnerability in NationalSecurityAgency emissary
Emissary has GitHub Actions Shell Injection via Workflow Inputs
Published
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.1epss 0.6%
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:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
NationalSecurityAgency · emissaryRelated CVEs — NationalSecurityAgency emissary
In the same product, most dangerous first.
CVE-2021-32647HIGHPost-authentication Remote Code Execution (RCE) in emissary:emissaryEPSS 2.9%CVE-2021-32639HIGHServer-Side Request Forgery (SSRF) in emissary:emissaryEPSS 1.4%CVE-2021-32634HIGHDeserialization of Untrusted Data in EmissaryEPSS 1.3%CVE-2026-35582HIGHEmissary has an OS Command Injection via Unvalidated IN_FILE_ENDING / OUT_FILE_ENDING in ExecutrixEPSS 0.9%CVE-2026-35581HIGHEmissary has a Command Injection via PLACE_NAME Configuration in ExecutrixEPSS 0.6%CVE-2026-54442MEDIUMNationalSecurityAgency/emissary: Incomplete fix for CVE-2026-35571: SSRFEPSS 0.4%