TI-2026-13380 Aliases CVE-2026-15978 GHSA-x6x2-r266-cx9p

Missing authentication in SGLang

HIGH 72CWE-306Published 2026-07-30 · Updated 2026-07-31

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-306.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00504 43rd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
SGLang	SGLang	up to v0.5.15	—	No fix listed	CNA

SGLang VendorSGLang Affected up to v0.5.15 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:lmsys:sglang::::::::	up to 0.5.15	Vulnerable	SGLang

cpe:2.3:a:lmsys:sglang:*:*:*:*:*:*:*:* Versions up to 0.5.15 Vulnerable ·SGLang

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-15978
2026-10-03 Alias added: GHSA-x6x2-r266-cx9p

References

Advisory 1

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

Other 1

https://github.com/sgl-project/sglang/security/advisories/GHSA-cpqq-22v3-2wfm

TI-2026-13378 Deserialization of untrusted data in SGLang CVSS 3.1CRITICAL 9.8
TI-2026-13373 SGLang contains an RCE vulnerability when the optional dumper subsystem is enabled… CVSS 3.1CRITICAL 9.8
TI-2026-05050 Code injection in SGLang CVSS 3.1CRITICAL 9.8
TI-2026-02644 Deserialization of untrusted data in SGLang CVSS 3.1CRITICAL 9.8
TI-2026-02643 Deserialization of untrusted data in SGLang CVSS 3.1CRITICAL 9.8
TI-2026-13379 Insufficiently protected credentials in SGLang CVSS 3.1HIGH 7.5

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences