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TI-2026-28768 Aliases CVE-2026-39890GHSA-32vr-5gcf-3pw2

PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading

Priority HIGH 82CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

PraisonAI is a multi-agent teams system. Prior to 4.5.115, the AgentService.loadAgentFromFile method uses the js-yaml library to parse YAML files without disabling dangerous tags (such as !!js/function and !!js/undefined). This allows an attacker to craft a malicious YAML file that, when parsed, executes arbitrary JavaScript code. An attacker can exploit this vulnerability by uploading a malicious agent definition file via the API endpoint, leading to remote code execution (RCE) on the server. This vulnerability is fixed in 4.5.115.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00589 48th percentileScored 2026-11-07
Fix Fixed PraisonAI (MervinPraison): 4.5.115praisonai (PyPI): 4.5.115

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MervinPraisonPraisonAIbefore 4.5.1154.5.115Patch availableCNA
—praisonai (PyPI)before 4.5.1154.5.115Patch availableGHSA-32vr-5gcf-3pw2
  • PraisonAI VendorMervinPraison Affected before 4.5.115 Fixed in 4.5.115 Patch available CNA
  • praisonai (PyPI) Vendor— Affected before 4.5.115 Fixed in 4.5.115 Patch available GHSA-32vr-5gcf-3pw2

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*up to 4.5.114VulnerableMervinPraison
  • cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* Versions up to 4.5.114 Vulnerable ·MervinPraison

Remediation

  • Fix · CNA PraisonAI (MervinPraison) Fixed in 4.5.115
  • Fix · GHSA-32vr-5gcf-3pw2 praisonai (PyPI) Fixed in 4.5.115 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39890
  2. 2026-10-03 Alias added: GHSA-32vr-5gcf-3pw2
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 2

Other 2

  • TI-2026-30083 Incomplete fix for CVE-2026-34935: Command Injection in MervinPraison/PraisonAI CVSS 3.1CRITICAL 9.8
  • TI-2026-29070 PraisonAI: Critical RCE via `type: job` workflow YAML CVSS 3.1CRITICAL 9.8
  • TI-2026-28940 PraisonAI has Server-Side Request Forgery via Unvalidated webhook_url in Jobs API CVSS 3.1CRITICAL 10.0
  • TI-2026-27159 PraisonAI: OS Command Injection in MCPHandler.parse_mcp_command() CVSS 3.1CRITICAL 9.8
  • TI-2026-27158 PraisonAI: Second-Order SQL Injection in `get_all_user_threads` CVSS 3.1CRITICAL 9.8
  • TI-2026-29071 PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions CVSS 3.1CRITICAL 9.1
See all 42 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences