CVE-2025-33243: 
NixOS vulnerability analysis and mitigation

CVE-2025-33243 is a deserialization of untrusted data vulnerability in the NVIDIA NeMo Framework that enables remote code execution in distributed environments. It affects all NeMo Framework versions prior to 2.6.1. The CVE was published on February 18, 2026, with an initial NVD analysis completed on February 20, 2026. NVIDIA assigned a CVSS v3.1 base score of 7.8 (High) (NVIDIA Advisory, Red Hat CVE).

The vulnerability is rooted in improper deserialization of untrusted data (CWE-502), which is associated with the CAPEC-586 Object Injection attack pattern. In distributed NeMo Framework environments, an attacker with local low-privilege access can supply maliciously crafted serialized data that, when deserialized by the framework, triggers arbitrary code execution without requiring user interaction. The attack vector is local (AV:L), with low attack complexity and low privileges required, meaning any authenticated local user in a distributed NeMo deployment could potentially exploit this flaw (NVIDIA Advisory, Red Hat CVE).

Successful exploitation can result in arbitrary code execution, privilege escalation, information disclosure, and data tampering on affected systems. All three security pillars — confidentiality, integrity, and availability — are rated as High impact, meaning an attacker could fully compromise an affected NeMo Framework node. In distributed AI/ML training environments, this could enable lateral movement across worker nodes, exfiltration of model weights or training data, and disruption of compute workloads (NVIDIA Advisory, Red Hat CVE).

There is no public proof-of-concept exploit code known at this time, and no evidence of in-the-wild exploitation has been reported. The EPSS score is approximately 0.34%, indicating a low current probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified (Red Hat CVE, NVIDIA Advisory).

NVIDIA has released NeMo Framework version 2.6.1 to address this vulnerability; upgrading to this version or later is the recommended remediation. Organizations running NeMo in distributed environments should prioritize patching, as those deployments represent the highest-risk configurations. No specific configuration-based workarounds have been published by NVIDIA; patch application is the primary mitigation (NVIDIA Advisory).

The vulnerability received brief coverage on social media shortly after disclosure, including a mention on Mastodon via The Hacker Wire. Red Hat tracked the CVE for potential impact on their products. No significant researcher commentary or broader media coverage has been identified beyond standard vulnerability aggregator entries (Red Hat CVE).