CVE-2026-35580 | THREATINT

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.

PUBLISHED Reserved 2026-04-03 | Published 2026-04-07 | Updated 2026-04-07 | Assigner GitHub_M

CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')

Product status

< 8.39.0

affected

References

github.com/...issary/security/advisories/GHSA-3g6g-gq4r-xjm9

github.com/NationalSecurityAgency/emissary/pull/1286

github.com/NationalSecurityAgency/emissary/pull/1288

cve.org (CVE-2026-35580)

nvd.nist.gov (CVE-2026-35580)

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