High severity · published Oct 12, 2026
CVE-2026-109227
SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SG
sglang · sgl-project
through 0.5.21 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109227
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109227
issue-tracking
https://github.com/sgl-project/sglang/issues/43710
technical-description
https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/qwen_vl.py#L267-L306
product
https://github.com/sgl-project/sglang
third-party-advisory
https://www.vulncheck.com/advisories/sglang-through-0.5.21-memory-exhaustion-dos-via-qwen-vl-video-preprocessing
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