Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck
CVE-2026-109227SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing
High 7.5
In plain English
A high-severity resource allocation without limits in sglang from sgl-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 56.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| sgl-project | sglang | 0 – through 0.5.21 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Issue #43710 issue-tracking
- https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/qwen_vl.py#L267-L306 technical-description
- https://github.com/sgl-project/sglang product
- VulnCheck Advisory: SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing third-party-advisory