Is CVE-2026-102634 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-102634 being exploited in the wild.

How severe is CVE-2026-102634?

High severity, with a CVSS score of 7.5, published 29 September 2026.

Which products and versions are affected?

Sgl-Project SGLang through 0.5.20.

Is there a fix for CVE-2026-102634?

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-2026-102634 attacked?

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

Am I affected by CVE-2026-102634?

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-2026-102634: SGLang prefill/decode disaggregation DoS in /generate with Mooncake backend

CVE-2026-102634 · Severity: high · CVSS 7.5 · Published 2026-09-29

SGLang is a high-performance serving framework for large language models. An attacker can send specially crafted concurrent requests to crash scheduler processes or hang other users' requests without authentication. This can disrupt service availability for legitimate users relying on the LLM service.

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

Quick answers

Is CVE-2026-102634 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-102634 being exploited in the wild.
How severe is CVE-2026-102634?: High severity, with a CVSS score of 7.5, published 29 September 2026.
Which products and versions are affected?: Sgl-Project SGLang through 0.5.20.
Is there a fix for CVE-2026-102634?: 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-2026-102634 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-102634?: 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

SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests when using the Mooncake KV transfer backend. Unauthenticated remote attackers can exploit this by sending concurrent requests with identical bootstrap_room values, causing scheduler process crashes or request hangs until transfer timeout, resulting in denial of service.

Affected products

sgl-project SGLang through 0.5.20

Timeline

2026-09-29: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.