CVE-2026-34939

Description

PraisonAI is a multi-agent teams system. Prior to version 4.5.90, MCPToolIndex.search_tools() compiles a caller-supplied string directly as a Python regular expression with no validation, sanitization, or timeout. A crafted regex causes catastrophic backtracking in the re engine, blocking the Python thread for hundreds of seconds and causing a complete service outage. This issue has been patched in version 4.5.90.

CVSS breakdown

Affected products

• MervinPraison / PraisonAI< 4.5.90 – < 4.5.90
• praison / praisonai4.5.90

References

• VENDOR_ADVISORYhttps://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7f