What is CVE-2026-40088?

CVE-2026-40088 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under OS Command Injection. CVSS score: 9.6/10. Published 2026-04-09.

How severe is CVE-2026-40088?

Critical severity. CVSS v3 base score is 9.6 out of 10.

RCE in Mervinpraison Praisonai

CVE-2026-40088

PraisonAI is a multi-agent teams system. Prior to 4.5.121, the execute_command function and workflow shell execution are exposed to user-controlled input via agent workflows, YAML definitions, and LLM-generated tool calls, allowing attackers to inject arbitrary shell commands through shell metacharacters. This vulnerability is fixed in 4.5.121.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-04-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002

Affected products

Mervinpraison Praisonai — versions < 4.5.121
Praison Praisonai

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/MervinPraison/PraisonAI/security/advisories/GHSA-2763-cj5r-c79m (Exploit, Vendor Advisory)
github.com/MervinPraison/PraisonAI/releases/tag/v4.5.121 (Release Notes)

Frequently asked questions

What is CVE-2026-40088?: CVE-2026-40088 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under OS Command Injection. CVSS score: 9.6/10. Published 2026-04-09.
How severe is CVE-2026-40088?: Critical severity. CVSS v3 base score is 9.6 out of 10.