Preface: If a sandbox platform evaluates an L7 policy (such as inspecting HTTP methods or URL paths), it must actively recognize the traffic as HTTP/REST. If an attacker wraps a REST payload inside an uninspected protocol, encrypts it via custom TLS tunnels, or forces a raw TCP connection, the L7 relay often becomes blind.

Many sandbox architectures route traffic through an L7 sidecar proxy using local environment variables (like HTTP_PROXY or HTTPS_PROXY). If a malicious script or process explicitly ignores these environment variables—or uses raw socket connections to dial out directly—it can walk straight past the L7 inspection layer unless a rigid firewall backstop (like Kubernetes NetworkPolicies or eBPF virtual switches) blocks it at L3/L4.

Detailed description: Attached infographic covers CVE-2026-65093 (Critical Sandbox Escape). CVE-2026-65093 describes a critical vulnerability where an attacker inside the container can cause a sandbox escape. This occurs when a script completely evades or bypasses OpenShell’s high-level restriction layer to run code directly or access unauthorized network scopes. Infographic explicitly visualizes this exact scenario across the bottom half:

•               The Low-Level Socket Bypass: The lower-left corner explicitly highlights an execution flow using import socket to form raw, low-level network connections. The caption reads: “Using low-level networking drops below the L7 boundary entirely.

•               The Environment Proxy Subversion: The lower-right corner highlights a scenario using session.trust_env = False to ignore local system proxy variables. Therefore, the script can explicitly instruct the HTTP client to bypass the system environment entirely.

According to the NVIDIA Product Security Bulletin, CVE-2026-65092 involves a flaw where an attacker can cause a path traversal bypass of L7 REST network policies inside the NVIDIA OpenShell Sandbox for Linux. The Code Snippet displayed in infographic (point 2 and point 3) , the Python code snippet illustrates an exploit attempt hitting a normalized local URI endpoint. In point 1, the openshell-policy.yaml configuration that dictates how network L7 domain and egress filters are applied (which the exploit is bypassing).

CVE-2026-65083: Sandbox Provisioning API Bypass

Vuln Stage: Triggered during initial environment setup via REST API.

Core Issue: Flawed reliance on an incomplete blocklist for dangerous keywords.

Result: Attackers bypass the secondary defense layer to inject unauthorized parameters.

Official announcement: Please refer to the link for details – https://nvidia.custhelp.com/app/answers/detail/a_id/5872