CVE-2026-109227
SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | sgl-project |
| Product | sglang |
| Published | Oct 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
sgl-project / sglang
0 ≤ 0.5.21
References
github.com: https://github.com/sgl-project/sglang/issues/43710 github.com: https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/qwen_vl.py#L267-L306 github.com: https://github.com/sgl-project/sglang vulncheck.com: https://www.vulncheck.com/advisories/sglang-through-0.5.21-memory-exhaustion-dos-via-qwen-vl-video-preprocessing
Credits
Jiapeng Li Jiajia Liu Jiadai Wang