CVE-2026-40159: PraisonAI is a multi-agent teams system

Q: How do I fix CVE-2026-40159?

praisonai: upgrade to 4.5.128. Exact commands for each OS are on this page.

Q: Is CVE-2026-40159 being exploited?

CVE-2026-40159 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-2026-40159 affect?

CVE-2026-40159 affects praisonai. Severity is medium (CVSS 5.5). PraisonAI is a multi-agent teams system. Prior to 4.5.128, PraisonAI’s MCP (Model Context Protocol) integration allows spawning background servers via stdio using user-supplied command strings (e.g., MCP("npx -y @smithery/cli ...")). These

Q: How urgent is CVE-2026-40159?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2026-40159 is a medium-severity flaw (CVSS 5.5) affecting praisonai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PraisonAI is a multi-agent teams system. Prior to 4.5.128, PraisonAI’s MCP (Model Context Protocol) integration allows spawning background servers via stdio using user-supplied command strings (e.g., MCP("npx -y @smithery/cli ...")). These commands are executed through Python’s subprocess module. By default, the implementation forwards the entire parent process environment to the spawned subprocess. As a result, any MCP command executed in this m

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-200, CWE-214
Published	2026-04-10
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-04-10 17:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

praison praisonai UPGRADE

Affected: < 4.5.128

Fixed in: 4.5.128

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.5.128 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade praisonai

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-2026-40159?

praisonai: upgrade to 4.5.128. Exact commands for each OS are on this page.

Is CVE-2026-40159 being exploited?

CVE-2026-40159 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-2026-40159 affect?

CVE-2026-40159 affects praisonai. Severity is medium (CVSS 5.5). PraisonAI is a multi-agent teams system. Prior to 4.5.128, PraisonAI’s MCP (Model Context Protocol) integration allows spawning background servers via stdio using user-supplied command strings (e.g., MCP("npx -y @smithery/cli ...")). These

How urgent is CVE-2026-40159?

Priority 21/100. No elevated risk signals yet.

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-40288 CRITICAL 9.8 UPGRADE UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40289 CRITICAL 9.1 UPGRADE UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40315 CRITICAL 9.8 UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40116 HIGH 7.5 UPGRADE PraisonAI is a multi-agent teams system
CVE-2026-40113 HIGH 8.4 UPGRADE PraisonAI is a multi-agent teams system

References

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