High
SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-109227
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 19:45 UTC · Revision 1
Source evidence
SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing
core-osv · Original sourcePublished 12 Oct 2026, 14:04 UTC
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.
osv:CVE-2026-109227
Complete source record
{
"id": "b4d2ad608e1b54cf1a4a57375f791699605ab7df304eaf902208cf3f1533aebe",
"url": "https://osv.dev/vulnerability/CVE-2026-109227",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing",
"summary": "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.",
"evidence": "osv:CVE-2026-109227",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-109227",
"aliases": [
"CVE-2026-109227"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/sgl-project/sglang",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "e00930c5489053f26d86b179cee0d087f846acbb"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "0.5.21"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "0.5.21"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109227.json"
}
}
],
"modified": "2026-10-28T02:30:22.990759298Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109227.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-109227",
"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",
"https://github.com/sgl-project/sglang",
"https://pypi.org/project/sglang",
"https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/qwen_vl.py#L267-L306"
],
"provider_metadata": {
"cwe_ids": [
"CWE-770"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109227.json"
}
},
"related_cves": [
{
"value": "CVE-2026-109227",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 489341,
"published_at": "2026-10-12T14:04:31.362+00:00"
}