CVE-2026-34939
Medium · 6.5CVSS
6.5
EPSS
0.4%
Published
Apr 3, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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