EUVD-2026-42900
GHSA-c6pq-cprj-62fw
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local malicious-file RCE: attacker supplies workflow files (AV:L) and a victim must execute them (UI:R), no prior auth needed (PR:N), yielding full C/I/A compromise of the runner.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
PraisonAI (pip package praisonaiagents) before 1.6.78 contains an unsafe dynamic module loading vulnerability in AgentFlow._resolve_pydantic_class (src/praisonai-agents/praisonaiagents/workflows/workflows.py). When a workflow step uses a string output_pydantic reference, the framework locates and imports a sibling tools.py from the workflow file's directory via importlib exec_module without sandboxing, ignoring the PRAISONAI_ALLOW_*_TOOLS environment variables. An attacker who controls a workflow file and its sibling tools.py can execute arbitrary Python code with the workflow runner's privileges when the workflow is executed via WorkflowManager or after load_yaml.
Articles & Coverage 1
AnalysisAI
Arbitrary Python code execution in PraisonAI (praisonaiagents) before 1.6.78 occurs when AgentFlow._resolve_pydantic_class resolves a string output_pydantic reference in a workflow step, causing the framework to import a sibling tools.py from the workflow file's directory via importlib exec_module without any sandboxing. Because this loader ignores the PRAISONAI_ALLOW_*_TOOLS environment guardrails, an attacker who supplies a malicious workflow file plus its tools.py runs code with the workflow runner's privileges the moment the workflow is executed via WorkflowManager or loaded through load_yaml. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that (1) the attacker controls a PraisonAI workflow file AND its sibling tools.py in the same directory, (2) the workflow step uses a string-typed output_pydantic reference (the specific feature that triggers _resolve_pydantic_class's directory search), and (3) a victim executes that workflow via WorkflowManager or after load_yaml. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:N/UI:P, VC:H/VI:H/VA:H, base 8.5) frames this as a high-impact but locally-scoped, interaction-dependent issue: full confidentiality, integrity and availability loss on the vulnerable system, but only after a victim executes a workflow the attacker influenced (UI:P). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker publishes or shares a seemingly benign PraisonAI workflow file (e.g., in a repo, template gallery, or shared directory) that uses a string output_pydantic reference and ships a malicious sibling tools.py containing top-level code such as a reverse shell. When a victim loads and runs that workflow via WorkflowManager or load_yaml, importlib exec_module executes the tools.py and the attacker's Python runs with the runner's privileges. … |
| Remediation | Vendor-released patch: upgrade praisonaiagents to 1.6.78 or later (pip install --upgrade 'praisonaiagents>=1.6.78') as the primary fix, per advisory GHSA-4gfv-wg42-7jw5. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all systems running praisonaiagents versions prior to 1.6.78 and immediately restrict workflow file sources to internal code-reviewed processes only; disable automatic loading of workflows from untrusted or external sources. …
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External POC / Exploit Code
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