sgl-project SGLang up to 0.5.19 Mooncake bootstrap_room allocation of resources

Summaryinfo

A vulnerability was found in sgl-project SGLang up to 0.5.19 and classified as problematic. Impacted is an unknown function of the component Mooncake. The manipulation of the argument bootstrap_room results in allocation of resources. This vulnerability is cataloged as CVE-2026-93688. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in sgl-project SGLang up to 0.5.19. It has been classified as problematic. Affected is an unknown code of the component Mooncake. The manipulation of the argument bootstrap_room with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

SGLang through 0.5.19 in prefill/decode disaggregation mode with Mooncake KV transfer backend fails to validate bootstrap_room values, allowing unbounded transfer state allocation. Unauthenticated attackers can reach the decode engine's POST /generate endpoint and submit arbitrary bootstrap_room values to exhaust prefill process memory until out-of-memory termination.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-93688 since 09/18/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Project Management Software

Vendor

• sgl-project

Name

• SGLang

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3
• 0.5.4
• 0.5.5
• 0.5.6
• 0.5.7
• 0.5.8
• 0.5.9
• 0.5.10
• 0.5.11
• 0.5.12
• 0.5.13
• 0.5.14
• 0.5.15
• 0.5.16
• 0.5.17
• 0.5.18
• 0.5.19

Website

• Product: https://github.com/sgl-project/sglang/

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