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.

PUBLISHED Reserved 2026-03-31 | Published 2026-04-03 | Updated 2026-04-06 | Assigner GitHub_M

Problem types

CWE-1333: Inefficient Regular Expression Complexity

Product status

References

github.com/...isonAI/security/advisories/GHSA-8w9j-hc3g-3g7f

cve.org (CVE-2026-34939)

nvd.nist.gov (CVE-2026-34939)

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