Is CVE-2026-39890 actively exploited?

No active exploitation of CVE-2026-39890 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39890 be exploited remotely?

Yes. CVE-2026-39890 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39890?

CVE-2026-39890 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-39890

CWE-502Published: April 8, 2026· Updated: Apr 15, 2026

9.8

CVSS v3.1

EPSS:0.29%probability of exploitation in 30 daysPercentile:51.9th

Official Description

PraisonAI is a multi-agent teams system. Prior to 4.5.115, the AgentService.loadAgentFromFile method uses the js-yaml library to parse YAML files without disabling dangerous tags (such as !!js/function and !!js/undefined). This allows an attacker to craft a malicious YAML file that, when parsed, executes arbitrary JavaScript code. An attacker can exploit this vulnerability by uploading a malicious agent definition file via the API endpoint, leading to remote code execution (RCE) on the server. This vulnerability is fixed in 4.5.115.

NVD Source

Risk Analysis

This critical vulnerability in PraisonAI allows for remote code execution due to unsafe YAML parsing in the AgentService.loadAgentFromFile method. An attacker can upload a malicious agent definition file via the API, leading to arbitrary JavaScript code execution on the server. The CVSS score of 9.8 indicates a severe risk.

No public exploit is currently known for this vulnerability. The flaw is remotely exploitable without authentication.

Recommended Action

PraisonAI users should update to version 4.5.115 or later to mitigate this vulnerability. Ensure that YAML parsing configurations disable dangerous tags to prevent arbitrary code execution.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-39890 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.