CVE-2026-109227

SGLang through 0.5.21 contains an unbounded memory allocation vulnerability in preprocess_video in qwen_vl.py that decodes frames at full source resolution before applying max_pixels limits. Remote attackers can submit high-resolution videos to /v1/chat/completions on Qwen-VL deployments, and concurrent requests exhaust worker memory causing denial of service.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/sgl-project/sglang
https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/qwen_vl.py#L267-L306
https://github.com/sgl-project/sglang/issues/43710
https://www.vulncheck.com/advisories/sglang-through-0.5.21-memory-exhaustion-dos-via-qwen-vl-video-preprocessing
https://github.com/sgl-project/sglang/issues/43710

Configurations

No configuration.

History

18 Oct 2026, 12:17

Type	Values Removed	Values Added
References	~~() https://github.com/sgl-project/sglang/issues/43710 -~~	() https://github.com/sgl-project/sglang/issues/43710 -

12 Oct 2026, 14:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-12 14:17

Updated : 2026-10-18 12:17

NVD link : CVE-2026-109227

Mitre link : CVE-2026-109227

CVE.ORG link : CVE-2026-109227

JSON object : View

Products Affected

No product.

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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