9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-7301

CVE-2026-7301: SGLanG: Multimodal scheduler deserializes untrusted pickle data on 0.0.0.0 ROUTER socket

SGLang's multimodal generation runtime scheduler's ROUTER socket binds to 0.0.0.0 by default and contains a sink that calls pickle.loads() on incoming messages, enabling RCE when exposed to the internet.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-7301

CVE-2026-7301:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
sglang	pip	>= 0.5.5, <= 0.5.12

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability, as described in CVE-2026-7301, involves the deserialization of untrusted data in SGLang's multimodal scheduler. The analysis of the provided information, particularly the detailed breakdown in the 'antiproof.ai' blog post, pointed to a specific code pattern involving pickle.loads() on data received from a ZMQ socket. By examining the source code of the sgl-project/sglang repository, specifically the python/sglang/multimodal_gen/runtime/managers/scheduler.py file, the Scheduler.recv_reqs function was identified. This function contains the exact vulnerable code snippet mentioned in the security advisory, where it receives a payload from a socket and deserializes it using pickle.loads without any prior validation. This allows for remote code execution. Additionally, the Scheduler.event_loop function was identified as a key component in the execution flow, as it calls recv_reqs to process incoming requests. Therefore, both functions would likely appear in a runtime profile when the vulnerability is triggered.

Vulnerable functions

Scheduler.recv_reqs

python/sglang/multimodal_gen/runtime/managers/scheduler.py

This function receives data from a ZMQ ROUTER socket and directly deserializes it using `pickle.loads()`. An attacker can send a specially crafted payload to this socket, which, upon deserialization, can result in remote code execution. The function does not validate or sanitize the incoming data before deserialization.

Scheduler.event_loop

python/sglang/multimodal_gen/runtime/managers/scheduler.py

This function serves as the main event loop for the scheduler. It is responsible for receiving and processing incoming requests by calling the vulnerable `recv_reqs` function. As it orchestrates the reception and handling of the malicious payload, it would appear in the stack trace during exploitation.

Vulnerability Intelligence
Miggo AI

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WAF Rule

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Reasoning

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