CVE-2026-40288: MervinPraison PraisonAI · OS Command Injection
Affects MervinPraison PraisonAISource CVE Database V5
Not known to be exploited · CVSS 9.8 Critical : upgrade to 4.5.139 as a priority.
Data as of 30 Oct 2026, 11:52 UTC
Contested
Critical score, yet low EPSS after six months- EPSS
- 0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 4.5.139, 1.5.140
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 14 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
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), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade PraisonAI and mervinpraison/PraisonAI to 4.5.139; praisonaiagents to 1.5.140.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| MervinPraisonPraisonAI | Affected
| Fixed in
|
| MervinPraisonpraisonaiagents | Affected
| Fixed in
|
GitHubmervinpraison/PraisonAIpkg:github/mervinpraison/PraisonAIOther 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
A fix is available in PraisonAI version 4.5.139 and praisonaiagents version 1.5.140. Users should upgrade to these or later versions to remediate this vulnerability. Until patched, avoid running untrusted or unauthenticated YAML workflow files, especially in CI pipelines, shared repositories, or multi-tenant deployments. Patch status is confirmed by the vendor advisory stating the issue is fixed in these versions.
Description
CVE-2026-40288 is a critical OS command injection vulnerability in MervinPraison's PraisonAI multi-agent teams system. Versions prior to 4.5.139 of PraisonAI and 1.5.140 of praisonaiagents improperly handle untrusted YAML workflow files, allowing arbitrary command and code execution without validation or sandboxing. This occurs because the workflow engine executes shell commands and Python scripts directly from YAML files, exposing the host system to full compromise if an attacker can supply or influence these files. The vulnerability is fixed in versions 4.5.139 and 1.