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VulnerabilityPublished

CVE-2026-40288: MervinPraison PraisonAI · OS Command Injection

Affects MervinPraison PraisonAISource CVE Database V5

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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

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.

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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
MervinPraisonPraisonAIAffected
  • <4.5.139
Fixed in
  • 4.5.139
MervinPraisonpraisonaiagentsAffected
  • <1.5.140
Fixed in
  • 1.5.140
GitHubmervinpraison/PraisonAIpkg:github/mervinpraison/PraisonAIOther threatsAffected
  • <4.5.139
Fixed in
  • 4.5.139

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.

References

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