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VU#777338: SGLang contains two remote code execution and one path traversal vulnerability
Three vulnerabilities have been discovered in the SGLang project, two enabling remote code execution (RCE), and one regarding a path traversal vulnerability. In order for an attacker to exploit these vulnerabilities, the multimodal generation mode must be enabled, and an attacker must have network access to the SGLang service. No patch is available at this time, and no response was obtained from the project maintainers during coordination.
DescriptionSGLang is an open-source framework for serving large language models (LLMs) and multimodal AI models, supporting models such as Qwen, DeepSeek, Mistral, and Skywork, and is compatible with OpenAI APIs. Three vulnerabilities have been discovered within the tool and are tracked as follows:
CVE-2026-7301
The multimodal generation runtime scheduler's ROUTER socket contains a sink that calls pickle.loads() on incoming messages, enabling RCE when exposed to the internet.
This vulnerability is distinct from CVE-2026-3060 and CVE-2026-3059, which would be open to the Internet via the ZMQ broker, which automatically binded to all network interfaces without user awareness. CVE-2026-7301 is exposed to the internet by default through the scheduler host, which binds to 0.0.0.0 by default.
CVE-2026-7302
The multimodal generation runtime is vulnerable to an unauthenticated path traversal vulnerability, allowing an attacker to write arbitrary files anywhere the server process has write access, by including ../ sequences in the upload filename when sent to specific endpoints.
CVE-2026-7304
The multimodal generation runtime is vulnerable to unauthenticated remote code execution when the --enable-custom-logit-processor option is enabled, as Python objects loaded via dill.loads() will be deserialized without validation.
If exploited, these vulnerabilities could allow an unauthenticated attacker to achieve remote code execution or arbitrary file writes on the host running SGLang. Deployments that expose the affected interface to untrusted networks are at the highest risk of exploitation.
SolutionUntil a patch is available, affected users should consider the following mitigations:
Mitigation- Restrict access to the service interfaces and ensure they are not exposed to untrusted networks.
- Implement network segmentation and access controls to prevent unauthorized interaction with the vulnerable endpoints.
Thanks to the reporter, Alon Shakevsky. This document was written by Christopher Cullen.
