sgl-project SGLang up to 0.5.20 Mooncake KV Transfer Backend bootstrap_room input validation

Summaryinfo

A vulnerability was found in sgl-project SGLang up to 0.5.20. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component Mooncake KV Transfer Backend. Executing a manipulation of the argument bootstrap_room can lead to input validation. This vulnerability is handled as CVE-2026-102634. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in sgl-project SGLang up to 0.5.20 and classified as problematic. This vulnerability affects some unknown processing of the component Mooncake KV Transfer Backend. The manipulation of the argument bootstrap_room with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. CVE summarizes:

SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.

The advisory is available at github.com. This vulnerability was named CVE-2026-102634 since 09/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/29/2026).

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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
• 0.5.20

Website

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

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Entryinfo

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