CVE-2026-35580CRITICAL 9.1EPSS p42.5%

CVE-2026-35580CVE-2026-35580

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS0.57% probability of exploitation · percentile 42.5% · 2026-06-18T12:00:27Z
Published2026-04-07
Last modified2026-04-16

Underlying weaknesses· 1

CWE-77

References

  1. https://github.com/NationalSecurityAgency/emissary/pull/1286
  2. https://github.com/NationalSecurityAgency/emissary/pull/1288
  3. https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-3g6g-gq4r-xjm9

1

TypeTargetConfidenceTier
WeaknessImproper Neutralization of Special Elements used in a Command ('Command Injection')cwe-770%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.