Is this vulnerability remotely exploitable over the network?

Yes, if the agent definition upload or configuration API is reachable by an attacker, they can remotely submit a malicious YAML file and trigger the vulnerable parsing path.

Does an attacker need privileged access to exploit this issue?

Not necessarily. Exploitation only requires the level of access needed to call the agent upload/definition endpoint, which may be low-privilege authenticated access or, in misconfigured environments, even anonymous access.

What is the safest general fix pattern for this vulnerability class?

The most robust fix is to treat configuration as pure data: disable all execution-capable tags in YAML, strictly limit the allowed schema, and avoid converting configuration directly into executable code or dynamically evaluated constructs.

Severity:

CRITICAL RISK

(9.8)

Unsafe YAML Deserialization (CWE-502) in PraisonAI AgentService.loadAgentFromFile

CVE-2026-39890

Published:

Apr 8, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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May 10, 2026

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HIGH RISK

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Remote Code Execution by Authenticated Users

May 10, 2026

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution on Server

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution on Server

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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Unsafe YAML Deserialization (CWE-502) in PraisonAI AgentService.loadAgentFromFile

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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