Is CVE-2026-109227 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-109227 being exploited in the wild.

How severe is CVE-2026-109227?

High severity, with a CVSS score of 7.5, published 12 October 2026.

Is there a fix for CVE-2026-109227?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-109227 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-109227?

Check whether you run SGLang at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-109227: SGLang unbounded memory allocation in video preprocessing

CVE-2026-109227 · Severity: high · CVSS 7.5 · Published 2026-10-12

SGLang is a serving framework for large language models that handles video input in chat requests. A vulnerability in video frame processing allows remote attackers to submit high-resolution videos that consume excessive memory, causing the service to crash and become unavailable. An attacker can exploit this by sending concurrent malicious requests to any SGLang deployment using Qwen-VL multimodal models.

Technologies: SGLang. Vendors: SGLang.

Quick answers

Is CVE-2026-109227 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-109227 being exploited in the wild.
How severe is CVE-2026-109227?: High severity, with a CVSS score of 7.5, published 12 October 2026.
Which products and versions are affected?: SGLang through 0.5.21.
Is there a fix for CVE-2026-109227?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-109227 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-109227?: Check whether you run SGLang at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The preprocess_video function in qwen_vl.py decodes video frames at full source resolution before applying max_pixels limits, leading to unbounded memory allocation. Remote attackers can submit high-resolution videos to the /v1/chat/completions endpoint, and concurrent requests exhaust worker memory causing denial of service. The vulnerability requires network access to an SGLang server but no authentication.

Affected products

SGLang SGLang through 0.5.21

Timeline

2026-10-12: disclosed

References

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