What is CVE-2026-35580?

CVE-2026-35580 is a critical-severity vulnerability in Nationalsecurityagency Emissary, classified under Command Injection. CVSS score: 9.1/10. Published 2026-04-07.

How severe is CVE-2026-35580?

Critical severity. CVSS v3 base score is 9.1 out of 10.

RCE in Nationalsecurityagency Emissary

CVE-2026-35580

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 ${{ }} e…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.000 (6.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Nationalsecurityagency Emissary — versions < 8.39.0

Weakness classification (CWE)

CWE-77 — Command Injection

References

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

Frequently asked questions

What is CVE-2026-35580?: CVE-2026-35580 is a critical-severity vulnerability in Nationalsecurityagency Emissary, classified under Command Injection. CVSS score: 9.1/10. Published 2026-04-07.
How severe is CVE-2026-35580?: Critical severity. CVSS v3 base score is 9.1 out of 10.