CVE-2026-35583: Emissary is a P2P based data-driven workflow engine

Q: How do I fix CVE-2026-35583?

emissary: upgrade to newer than 8.38.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-35583 being exploited?

CVE-2026-35583 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35583 affect?

CVE-2026-35583 affects emissary. Severity is medium (CVSS 5.3). Emissary is a P2P based data-driven workflow engine. Prior to 8.39.0, the configuration API endpoint (/api/configuration/{name}) validated configuration names using a blacklist approach that checked for \, /, .., and trailing .. This could

Q: How urgent is CVE-2026-35583?

Priority 35/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-35583 is a medium-severity flaw (CVSS 5.3) affecting emissary. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Emissary is a P2P based data-driven workflow engine. Prior to 8.39.0, the configuration API endpoint (/api/configuration/{name}) validated configuration names using a blacklist approach that checked for \, /, .., and trailing .. This could potentially be bypassed using URL-encoded variants, double-encoding, or Unicode normalization to achieve path traversal and read configuration files outside the intended directory. This vulnerability is fixed i

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: nsa

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 17:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

nsa emissary UPGRADE

Affected: <= 8.38.0

Fixed in: newer than 8.38.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy emissary || rpm -q emissary || emissary --version

2. UPGRADE to newer than 8.38.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade emissary

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade emissary

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35583?

emissary: upgrade to newer than 8.38.0. Exact commands for each OS are on this page.

Is CVE-2026-35583 being exploited?

CVE-2026-35583 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35583 affect?

CVE-2026-35583 affects emissary. Severity is medium (CVSS 5.3). Emissary is a P2P based data-driven workflow engine. Prior to 8.39.0, the configuration API endpoint (/api/configuration/{name}) validated configuration names using a blacklist approach that checked for \, /, .., and trailing .. This could

How urgent is CVE-2026-35583?

Priority 35/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-35582 HIGH 8.8 UPGRADE Emissary is a P2P based data-driven workflow engine
CVE-2026-35580 CRITICAL 9.1 UPGRADE Emissary is a P2P based data-driven workflow engine
CVE-2026-35581 HIGH 7.2 UPGRADE Emissary is a P2P based data-driven workflow engine
CVE-2026-35571 MEDIUM 4.8 UPGRADE Emissary is a P2P based data-driven workflow engine

References

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