MervinPraison PraisonAI up to 4.6.77 Prompt Injection Defense injection

Summaryinfo

A vulnerability has been found in MervinPraison PraisonAI up to 4.6.77 and classified as critical. This issue affects some unknown processing of the component Prompt Injection Defense. This manipulation causes injection. This vulnerability is handled as CVE-2026-61439. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in MervinPraison PraisonAI up to 4.6.77. Affected by this vulnerability is an unknown part of the component Prompt Injection Defense. The manipulation with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

PraisonAI versions before 4.6.78 contain a prompt injection defense misconfiguration where the block threshold defaults to CRITICAL severity, allowing HIGH-level threats to pass through unblocked. Attackers can submit single-vector prompt injection attacks such as instruction overrides or financial manipulation that trigger HIGH severity detection but are logged without blocking, enabling system prompt extraction and unauthorized tool invocations.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-61439 since 07/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading to version 4.6.78 eliminates this vulnerability.

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Productinfo

Vendor

• MervinPraison

Name

• PraisonAI

Version

• 4.6.0
• 4.6.1
• 4.6.2
• 4.6.3
• 4.6.4
• 4.6.5
• 4.6.6
• 4.6.7
• 4.6.8
• 4.6.9
• 4.6.10
• 4.6.11
• 4.6.12
• 4.6.13
• 4.6.14
• 4.6.15
• 4.6.16
• 4.6.17
• 4.6.18
• 4.6.19
• 4.6.20
• 4.6.21
• 4.6.22
• 4.6.23
• 4.6.24
• 4.6.25
• 4.6.26
• 4.6.27
• 4.6.28
• 4.6.29
• 4.6.30
• 4.6.31
• 4.6.32
• 4.6.33
• 4.6.34
• 4.6.35
• 4.6.36
• 4.6.37
• 4.6.38
• 4.6.39
• 4.6.40
• 4.6.41
• 4.6.42
• 4.6.43
• 4.6.44
• 4.6.45
• 4.6.46
• 4.6.47
• 4.6.48
• 4.6.49
• 4.6.50
• 4.6.51
• 4.6.52
• 4.6.53
• 4.6.54
• 4.6.55
• 4.6.56
• 4.6.57
• 4.6.58
• 4.6.59
• 4.6.60
• 4.6.61
• 4.6.62
• 4.6.63
• 4.6.64
• 4.6.65
• 4.6.66
• 4.6.67
• 4.6.68
• 4.6.69
• 4.6.70
• 4.6.71
• 4.6.72
• 4.6.73
• 4.6.74
• 4.6.75
• 4.6.76
• 4.6.77

Website

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

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