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Vulnerability record · CVE-2026-35580 · published 7 April 2026

CVE-2026-35580: Nsa emissary command injection vulnerability

Nsa · Emissary

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.

9.1 CVSS 3.1 Critical EPSS 0.69% · top 49.1% CWE-77 · Command injection
9.1CVSS 3.1 base score
0.69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/NationalSecurityAgency/emissary/pull/1286 Patch
https://github.com/NationalSecurityAgency/emissary/pull/1288 Patch
https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-3g6g-gq4r-xjm9 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2021-32639Nsa emissary server-side request forgery (ssrf) vulnerabilityEmissary is a P2P-based, data-driven workflow engine. Emissary version 6.4.0 is vulnerable to Server-Side Request Forgery (SSRF). In particular, the …EPSS 1.4%9.1CVE-2021-32647Nsa emissary injection vulnerabilityEmissary is a P2P based data-driven workflow engine. Affected versions of Emissary are vulnerable to post-authentication Remote Code Execution (RCE).…EPSS 2.9%8.8CVE-2026-35582Nsa emissary os command injection vulnerabilityEmissary is a P2P based data-driven workflow engine. In versions 8.42.0 and below, Executrix.getCommand() is vulnerable to OS command injection becau…EPSS 1.1%8.8CVE-2021-32094Nsa emissary unrestricted file upload vulnerabilityU.S. National Security Agency (NSA) Emissary 5.9.0 allows an authenticated user to upload arbitrary files.EPSS 1.2%8.8CVE-2021-32096Nsa emissary cross-site request forgery vulnerabilityThe ConsoleAction component of U.S. National Security Agency (NSA) Emissary 5.9.0 allows a CSRF attack that results in injecting arbitrary Ruby code …EPSS 0.59%8.1CVE-2021-32095Nsa emissary missing authorization vulnerabilityU.S. National Security Agency (NSA) Emissary 5.9.0 allows an authenticated user to delete arbitrary files.EPSS 0.89%7.2CVE-2026-35581Nsa emissary os command injection vulnerabilityEmissary is a P2P based data-driven workflow engine. Prior to 8.39.0, the Executrix utility class constructed shell commands by concatenating configu…EPSS 0.90%7.2CVE-2021-32634Nsa emissary deserialization of untrusted data vulnerabilityEmissary is a distributed, peer-to-peer, data-driven workflow framework. Emissary 6.4.0 is vulnerable to Unsafe Deserialization of post-authenticated…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2026-35580), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.