SGLang up to 0.5.15 Model Weight Loading update_weights_from_disk deserialization

Summaryinfo

A vulnerability classified as critical was found in SGLang up to 0.5.15. Affected by this issue is the function update_weights_from_disk of the component Model Weight Loading. Such manipulation leads to deserialization. This vulnerability is uniquely identified as CVE-2026-15976. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in SGLang up to 0.5.15. It has been rated as critical. Affected by this issue is the function update_weights_from_disk of the component Model Weight Loading. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

SGLang contains a RCE vulnerability when attempting to load model weights from a HuggingFace repository, specifically within the /update_weights_from_disk, where torch.load(..., weights_only=False) fallback enables pickle deserialization of .bin files.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-15976 since 07/16/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. 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 07/30/2026).

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

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

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CPE 2.2info

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