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Vulnerability record · CVE-2026-15978 · published 30 July 2026

CVE-2026-15978: Lmsys sglang missing authentication for critical function vulnerability

Lmsys · Sglang

SGLang contains a model weight exfiltration vulnerability when no API keys are configured, as SGLang will expose two endpoints that allow a remote attacker to trigger distributed weight broadcasting using NCCL and then triggering data transfer, attackers can exfiltrate all model weights.

7.5 CVSS 3.1 High EPSS 0.50% · top 59.3% CWE-306 · Missing authentication for critical function
7.5CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
4 Aug 2026Last modified by NVD

Description

SGLang contains a model weight exfiltration vulnerability when no API keys are configured, as SGLang will expose two endpoints that allow a remote attacker to trigger distributed weight broadcasting using NCCL and then triggering data transfer, attackers can exfiltrate all model weights.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/sgl-project/sglang/security/advisories/GHSA-cpqq-22v3-2wfm Broken Link
https://thoughts.apoorvdayal.com/posts/sglang-disclosures/ Third Party AdvisoryMitigation
https://thoughts.apoorvdayal.com/posts/sglang-disclosures/ Third Party AdvisoryMitigation

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-15969Lmsys sglang deserialization of untrusted data vulnerabilitySGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomplete denylist, allowing arbitrary comma…EPSS 1.0%9.8CVE-2026-15971Lmsys sglang vulnerabilitySGLang contains an RCE vulnerability when the optional dumper subsystem is enabled, allowing for a sandbox escape when DUMPER_SERVER_PORT is set, ena…EPSS 0.73%9.8CVE-2026-15976Lmsys sglang deserialization of untrusted data vulnerabilitySGLang contains a RCE vulnerability when attempting to load model weights from a HuggingFace repository, specifically within the /update_weights_from…EPSS 0.60%9.8CVE-2026-7301Lmsys sglang deserialization of untrusted data vulnerabilitySGLangs multimodal generation runtime scheduler's ROUTER socket binds to 0.0.0.0 by default and contains a sink that calls pickle.loads() on incoming…EPSS 0.60%9.8CVE-2026-7304Lmsys sglang deserialization of untrusted data vulnerabilitySGLangs multimodal generation runtime is vulnerable to unauthenticated remote code execution when the --enable-custom-logit-processor option is enabl…EPSS 0.88%9.8CVE-2026-5760Lmsys sglang code injection vulnerabilitySGLang's reranking endpoint (/v1/rerank) achieves Remote Code Execution (RCE) when a model file containing a malcious tokenizer.chat_template is load…EPSS 1.1%9.8CVE-2026-3059Lmsys sglang deserialization of untrusted data vulnerabilitySGLang's multimodal generation module is vulnerable to unauthenticated remote code execution through the ZMQ broker, which deserializes untrusted dat…EPSS 1.3%9.8CVE-2026-3060Lmsys sglang deserialization of untrusted data vulnerabilitySGLang' encoder parallel disaggregation system is vulnerable to unauthenticated remote code execution through the disaggregation module, which deseri…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2026-15978), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.