sgl-project SGLang up to 0.5.19 Prefill Bootstrap Service rank_ip/rank_port server-side request forgery

Summaryinfo

A vulnerability was found in sgl-project SGLang up to 0.5.19. It has been rated as critical. Impacted is an unknown function of the component Prefill Bootstrap Service. Performing a manipulation of the argument rank_ip/rank_port results in server-side request forgery. This vulnerability is known as CVE-2026-92972. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in sgl-project SGLang up to 0.5.19. It has been classified as critical. This affects an unknown function of the component Prefill Bootstrap Service. The manipulation of the argument rank_ip/rank_port with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

SGLang through 0.5.19 in prefill/decode disaggregation mode contains an unauthenticated PUT /route endpoint on the prefill bootstrap service that allows attackers to poison the KV transfer routing table. Attackers can supply arbitrary rank_ip and rank_port values to redirect decode workers to attacker-controlled endpoints, causing denial of service or disclosure of KV transfer metadata including session identifiers and tensor-parallel topology parameters.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-92972 since 09/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

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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