Is CVE-2026-93688 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-93688 being exploited in the wild.

How severe is CVE-2026-93688?

High severity, with a CVSS score of 7.5, published 18 September 2026.

Which products and versions are affected?

SGLang Project SGLang through 0.5.19.

Is there a fix for CVE-2026-93688?

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-2026-93688 attacked?

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

Am I affected by CVE-2026-93688?

Check whether you run SGLang 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-2026-93688: SGLang denial of service in prefill/decode disaggregation mode with Mooncake backend

CVE-2026-93688 · Severity: high · CVSS 7.5 · Published 2026-09-18

SGLang is a serving framework for large language models that can be deployed in a disaggregated architecture where prefill and decode processing are separated. An unauthenticated attacker can send specially crafted requests to the decode engine that cause unbounded memory allocation in the prefill process, eventually exhausting all available memory and causing the service to crash.

Technologies: SGLang Project SGLang. Vendors: SGLang Project.

Quick answers

Is CVE-2026-93688 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-93688 being exploited in the wild.
How severe is CVE-2026-93688?: High severity, with a CVSS score of 7.5, published 18 September 2026.
Which products and versions are affected?: SGLang Project SGLang through 0.5.19.
Is there a fix for CVE-2026-93688?: 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-2026-93688 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-93688?: Check whether you run SGLang 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 vulnerability exists in prefill/decode disaggregation mode when using the Mooncake KV transfer backend. The POST /generate endpoint accessible on the decode engine fails to validate bootstrap_room parameter values, allowing attackers to trigger arbitrary memory allocation on the prefill engine via the KV transfer mechanism. This is a denial-of-service condition that terminates the prefill process due to out-of-memory conditions.

Affected products

SGLang Project SGLang through 0.5.19

Timeline

2026-09-18: disclosed

References

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