CVE-2026-15978

⚠️ high

Summary

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 Score

7.5

High

EPSS Score

0.3

Exploit Probability

Published Date

2026-07-30

First Seen: 2026-07-31

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 67.8% of all 360,673 vulnerabilities in our database.

#116,318

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Jul 31, 2026

🔍 Exploitation Status

Poc

Proof-of-concept available

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

SSVC data provided by CISA

Last Modified 2026-08-04

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-306

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
lmsys	sglang	Affected	< 0.5.15

🔗 References 2

https://github.com/sgl-project/sglang/security/advis...

Broken Link

https://thoughts.apoorvdayal.com/posts/sglang-disclo...

Third Party Advisory Mitigation

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-15969	⛔ critical	9.8	1.0	SGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomplete den...	2026-07-30
CVE-2026-15971	⛔ critical	9.8	0.4	SGLang contains an RCE vulnerability when the optional dumper subsystem is enabled, allowing for a sandbox escape when D...	2026-07-30
CVE-2026-15974	🔶 medium	6.5	0.2	SGLang contains an SSRF and local file read in the multimodal generation endpoint /v1/chat/completions due to unsanitize...	2026-07-30
CVE-2026-15976	⛔ critical	9.8	0.3	SGLang contains a RCE vulnerability when attempting to load model weights from a HuggingFace repository, specifically wi...	2026-07-30
CVE-2026-15977	⚠️ high	7.5	0.2	SGLang contains a credential leakage vulnerability in the /server_info endpoint, which will return API keys and SSL keyf...	2026-07-30
CVE-2026-14890	⛔ critical	9.1	0.9	SGLang uses an expert-parallel backup subsystem that exposes a ZeroMQ PULL socket on a routable network interface that d...	2026-07-16

These CVEs affect the same products