CVE-2026-35580: NationalSecurityAgency emissary · Command Injection
Affects NationalSecurityAgency emissarySource CVE Database V5
Not known to be exploited · CVSS 9.1 Critical : upgrade to 8.39.0 as a priority.
Data as of 30 Oct 2026, 06:59 UTC
Contested
Critical score, yet low EPSS after six months- EPSS
- 0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 8.39.0
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 7 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade emissary and nationalsecurityagency/emissary to 8.39.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| NationalSecurityAgencyemissary | Affected
| Fixed in
|
GitHubnationalsecurityagency/emissarypkg:github/nationalsecurityagency/emissaryOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
This vulnerability is fixed in Emissary version 8.39.0. Users should upgrade to version 8.39.0 or later to remediate this issue. No additional mitigations are specified.
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.