CVE-2026-24217: NVIDIA BioNeMo Path Traversal Flaw

CVE-2026-24217 Overview

NVIDIA BioNeMo Core for Linux contains a path traversal vulnerability triggered when a user loads a malicious file. An attacker who convinces a victim to load a crafted file can escape intended directory boundaries and write or access files outside the expected scope. Successful exploitation may lead to code execution, denial of service, information disclosure, and data tampering. The flaw is tracked under CWE-29: Path Traversal: '..\filename' and affects BioNeMo Core, NVIDIA's framework for building and deploying generative AI models for drug discovery and computational biology workloads.

Critical Impact

Loading a malicious file into NVIDIA BioNeMo Core can result in arbitrary code execution, data tampering, denial of service, and disclosure of sensitive model or research data.

Affected Products

• NVIDIA BioNeMo Core for Linux
• Refer to the NVIDIA Security Bulletin for specific affected versions
• Hosts running BioNeMo workloads that process untrusted model or data files

Discovery Timeline

• 2026-05-20 - CVE-2026-24217 published to NVD
• 2026-05-20 - Last updated in NVD database

Technical Details for CVE-2026-24217

Vulnerability Analysis

The vulnerability resides in BioNeMo Core's file loading logic. When the application processes a user-supplied file, it fails to properly canonicalize or validate path components contained within the file or its references. An attacker can craft a file that embeds traversal sequences such as ..\ or ../ to escape the intended working directory. Because BioNeMo is commonly used to load model checkpoints, configuration files, and dataset archives, the attack surface is broad. The classification under [CWE-29] specifically targets Windows-style backslash traversal sequences, though Linux-based deployments are explicitly listed as affected by NVIDIA's advisory.

Root Cause

The root cause is insufficient input validation on file paths supplied through loaded content. BioNeMo Core does not normalize relative path segments before resolving destinations on disk. This allows files referenced inside an archive or model artifact to point outside the extraction root.

Attack Vector

Exploitation requires user interaction. An attacker hosts or distributes a malicious model artifact, dataset, or configuration file. A researcher or automated pipeline loads the file into BioNeMo Core. The application then writes or reads files at attacker-controlled paths. The network attack vector reflects that the malicious file can be delivered remotely, for example via a compromised model registry or shared dataset repository.

No verified proof-of-concept code is publicly available. Refer to the NVIDIA Support Response for vendor-confirmed technical context.

Detection Methods for CVE-2026-24217

Indicators of Compromise

• File system writes by BioNeMo processes to paths outside the configured workspace, model cache, or dataset directories
• Presence of traversal sequences such as ..\, ..%5c, or ../ inside loaded .tar, .zip, .ckpt, or configuration files
• Unexpected child processes spawned by BioNeMo Python interpreters following a model load operation
• Modification of system binaries, cron files, or SSH keys shortly after BioNeMo file ingestion

Detection Strategies

• Inspect archives and model artifacts before loading by enumerating member paths and rejecting any containing .. segments
• Monitor process telemetry for BioNeMo workloads that touch directories outside their declared working set
• Log all file load operations with full resolved paths to enable retrospective hunts for traversal attempts
• Apply behavioral identification rules that flag deserialization or extraction routines writing to sensitive system paths

Monitoring Recommendations

• Forward host file integrity monitoring events from BioNeMo servers into a centralized data lake for correlation
• Alert on writes to /etc, /root, ~/.ssh, or other privileged paths originating from Python or BioNeMo CLI processes
• Track outbound network connections initiated by BioNeMo after a model load to detect post-exploitation activity

How to Mitigate CVE-2026-24217

Immediate Actions Required

• Apply the fixed BioNeMo Core release identified in the NVIDIA security bulletin
• Restrict BioNeMo Core to load only files from trusted, integrity-verified sources
• Run BioNeMo workloads under a dedicated unprivileged service account with constrained filesystem access
• Audit existing model caches and dataset directories for files placed outside expected paths

Patch Information

NVIDIA has published a customer support response for this vulnerability. Administrators should consult the NVIDIA Support Response for the fixed version and download links. Full CVE record details are available from the NVD CVE-2026-24217 Details and the CVE.org Record.

Workarounds

• Validate every archive or model artifact with a pre-load script that rejects entries containing .., absolute paths, or symbolic links
• Execute BioNeMo Core inside a container or sandbox with read-only root filesystem and bind-mounted data directories
• Restrict network egress from BioNeMo hosts to approved model registries to prevent retrieval of attacker-controlled files
• Enforce mandatory access controls such as AppArmor or SELinux profiles that limit BioNeMo write access to its working directory

# Configuration example: validate archive paths before loading
python3 -c "import tarfile,sys
t=tarfile.open(sys.argv[1])
for m in t.getmembers():
    if m.name.startswith('/') or '..' in m.name.split('/'):
        print('REJECT:', m.name); sys.exit(1)
print('OK')" suspicious_model.tar