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: 2026-04-03
Score: 6.5 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-8w9j-hc3g-3g7f PraisonAI Has ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()
History

Sat, 04 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
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.
Title PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()
Weaknesses CWE-1333
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-03T22:52:32.763Z

Reserved: 2026-03-31T17:27:08.660Z

Link: CVE-2026-34939

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-03T23:17:06.330

Modified: 2026-04-03T23:17:06.330

Link: CVE-2026-34939

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses