CVE-2026-35580

CRITICAL EPSS 42.7%
Published Apr 7, 20262mo ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Critical
Find Similar
Published Apr 7, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
9.1
Exploitability
2.3
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
42.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-77 Command Injection Injection

Affected Products 1

VendorProductVersionRange
nsaemissary*≥5.10.0  –  ≤8.38.0

References 3

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

Remediation

  • github.com https://github.com/NationalSecurityAgency/emissary/pull/1286
    Patch
  • github.com https://github.com/NationalSecurityAgency/emissary/pull/1288
    Patch