lmsys sglang update_weights_from_tensor main deserialization
Priority HIGH 70CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.
Summary
A security flaw has been discovered in lmsys sglang 0.4.6. Affected by this vulnerability is the function main of the file /update_weights_from_tensor. The manipulation of the argument serialized_named_tensors results in deserialization. The attack can be launched remotely. The exploit has been released to the public and may be exploited. The vendor was contacted early about this disclosure but did not respond in any way.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00408 35th percentileScored 2026-11-07
Fix Fixed sglang (PyPI): 0.5.4
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 | 0.4.6 | — | No fix listed | CNA |
| — | sglang (PyPI) | before 0.5.4 | 0.5.4 | Patch available | GHSA-9w53-xr52-mwgj |
- sglang VendorSGLang Affected 0.4.6 Fixed in — No fix listed CNA
- sglang (PyPI) Vendor— Affected before 0.5.4 Fixed in 0.5.4 Patch available GHSA-9w53-xr52-mwgj
Remediation
- Fix · GHSA-9w53-xr52-mwgj sglang (PyPI) Fixed in 0.5.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-10164
- 2026-10-03 Alias added: GHSA-9w53-xr52-mwgj
References
More SGLang vulnerabilities
- TI-2026-62707 Deserialization of untrusted data in SGLang CVSS 3.1CRITICAL 9.8
- TI-2026-59347 Code injection in SGLang CVSS 3.1CRITICAL 9.8
- 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
Sources
- CVE-2025-10164 · CVE Program
- CVE-2025-10164 · NVD
- FIRST EPSS
- GHSA-9w53-xr52-mwgj · GitHub Advisory Database · CC BY 4.0
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