PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()_CVE-2026-34939

6.5 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-34939

Source GitHub_M

Published Apr 3, 2026 at 22:52

Modified Apr 6, 2026 at 19:05

Affected Product

Vendor MervinPraison

Product PraisonAI

Version < 4.5.90

Affected Versions MervinPraison PraisonAI < 4.5.90

CWE Classification

CWE-1333

References

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

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    "published": "2026-04-03T22:52:32.763Z",
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