MervinPraison PraisonAI up to 4.5.89 Regex MCPToolIndex.search_tools redos

Summaryinfo

A vulnerability, which was classified as problematic, has been found in MervinPraison PraisonAI up to 4.5.89. This vulnerability affects the function MCPToolIndex.search_tools of the component Regex Handler. This manipulation causes redos. This vulnerability is tracked as CVE-2026-34939. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in MervinPraison PraisonAI up to 4.5.89. It has been declared as problematic. Affected by this vulnerability is the function MCPToolIndex.search_tools of the component Regex Handler. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34939 since 03/31/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1449.003 for this issue.

Upgrading to version 4.5.90 eliminates this vulnerability.

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Productinfo

Vendor

• MervinPraison

Name

• PraisonAI

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6
• 4.5.7
• 4.5.8
• 4.5.9
• 4.5.10
• 4.5.11
• 4.5.12
• 4.5.13
• 4.5.14
• 4.5.15
• 4.5.16
• 4.5.17
• 4.5.18
• 4.5.19
• 4.5.20
• 4.5.21
• 4.5.22
• 4.5.23
• 4.5.24
• 4.5.25
• 4.5.26
• 4.5.27
• 4.5.28
• 4.5.29
• 4.5.30
• 4.5.31
• 4.5.32
• 4.5.33
• 4.5.34
• 4.5.35
• 4.5.36
• 4.5.37
• 4.5.38
• 4.5.39
• 4.5.40
• 4.5.41
• 4.5.42
• 4.5.43
• 4.5.44
• 4.5.45
• 4.5.46
• 4.5.47
• 4.5.48
• 4.5.49
• 4.5.50
• 4.5.51
• 4.5.52
• 4.5.53
• 4.5.54
• 4.5.55
• 4.5.56
• 4.5.57
• 4.5.58
• 4.5.59
• 4.5.60
• 4.5.61
• 4.5.62
• 4.5.63
• 4.5.64
• 4.5.65
• 4.5.66
• 4.5.67
• 4.5.68
• 4.5.69
• 4.5.70
• 4.5.71
• 4.5.72
• 4.5.73
• 4.5.74
• 4.5.75
• 4.5.76
• 4.5.77
• 4.5.78
• 4.5.79
• 4.5.80
• 4.5.81
• 4.5.82
• 4.5.83
• 4.5.84
• 4.5.85
• 4.5.86
• 4.5.87
• 4.5.88
• 4.5.89

Website

• Product: https://github.com/MervinPraison/PraisonAI/

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