Is CVE-2026-112083 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-112083 being exploited in the wild.

How severe is CVE-2026-112083?

Medium severity, with a CVSS score of 5.3, published 19 October 2026.

Which products and versions are affected?

Sgl-Project SGLang up to 0.5.19.

Is there a fix for CVE-2026-112083?

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-2026-112083 attacked?

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

Am I affected by CVE-2026-112083?

Check whether you run Sgl-Project 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-2026-112083: SGLang weight exporter denial of service via invalid group name

CVE-2026-112083 · Severity: medium · CVSS 5.3 · Published 2026-10-19

SGLang is a high-performance serving framework for large language models. A flaw in the weight exporter component allows an unauthenticated attacker to crash the server by sending a request to the `/send_weights_to_remote_instance` endpoint with an invalid group name. An attacker can cause a complete service outage with a single malformed request.

Technologies: Sgl-Project SGLang. Vendors: Sgl-Project.

Quick answers

Is CVE-2026-112083 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-112083 being exploited in the wild.
How severe is CVE-2026-112083?: Medium severity, with a CVSS score of 5.3, published 19 October 2026.
Which products and versions are affected?: Sgl-Project SGLang up to 0.5.19.
Is there a fix for CVE-2026-112083?: 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-2026-112083 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-112083?: Check whether you run Sgl-Project 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 WeightExporter.send_weights_to_remote_instance function in weight_exporter.py contains a logic error where it attempts to validate a group_name against a dictionary using a subscript access before checking if the key exists. This raises a KeyError instead of executing the intended validation logic, which propagates uncaught through the scheduler event loop and terminates the server process. The endpoint accepts requests with default parameters and does not require authentication (AuthLevel.ADMIN_OPTIONAL with no API key set).

Affected products

sgl-project SGLang up to 0.5.19

Timeline

2026-10-01: disclosed: Bug report filed on GitHub
2026-10-19: advisory: CVE-2026-112083 published

References

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