CVE-2026-34939
MEDIUMPraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()
Title source: cnaDescription
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.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7f
Scores
CVSS v3
6.5
EPSS
0.0040
EPSS Percentile
31.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-1333
Status
published
Products (3)
MervinPraison/PraisonAI
< 4.5.90
praison/praisonai
< 4.5.90
pypi/praisonai
0 - 4.5.90PyPI
Published
Apr 03, 2026
Tracked Since
Apr 04, 2026