CVE-2026-109227: Allocation of Resources Without Limits or Throttling in sgl-project sglang
Description
SGLang versions up to 0.5.21 have a vulnerability in the preprocess_video function of qwen_vl.py that allows unbounded memory allocation. This occurs because video frames are decoded at full source resolution before applying any pixel limits. Remote attackers can exploit this by submitting high-resolution videos to the /v1/chat/completions endpoint, causing concurrent requests to exhaust worker memory and result in denial of service.
CVSS v4.0
Score 8.7high
Affected software
sgl-project
sglang
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-109227 is an unbounded memory allocation vulnerability in SGLang through version 0.5.21. The flaw exists in the preprocess_video function within qwen_vl.py, which decodes video frames at full source resolution prior to enforcing max_pixels limits. This allows remote attackers to submit high-resolution videos to the /v1/chat/completions API endpoint on Qwen-VL deployments, leading to excessive memory consumption. When multiple such requests occur concurrently, the worker memory can be exhausted, causing a denial of service condition.
Potential Impact
Successful exploitation results in denial of service by exhausting the memory resources of the worker handling video processing. This can disrupt availability of the affected service, potentially impacting all users relying on the /v1/chat/completions endpoint for video input processing.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting the size or resolution of video inputs accepted by the /v1/chat/completions endpoint or implementing request throttling to reduce the risk of memory exhaustion.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-12T13:46:32.999Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6accec5f2cdf04f6569f8106
Added to database: 10/12/2026, 14:19:11 UTC
Last enriched: 10/12/2026, 14:33:29 UTC
Last updated: 10/12/2026, 21:47:19 UTC
Views: 14
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