CVE-2026-35580

critical · 9.1

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

0.6%

EPSS (exploit prob.)

46th

EPSS percentile

2026-04-07

Published

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

Weaknesses

CWE-77

Affected products

Vendor	Product	Affected versions
nsa	emissary	>= 5.10.0, <= 8.38.0

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-35580