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TI-2026-21211 Aliases CVE-2026-26220GHSA-xxv9-73gc-96fm

LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE

Priority HIGH 81CWE-502Published · 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
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

LightLLM version 1.1.0 and prior contain an unauthenticated remote code execution vulnerability in PD (prefill-decode) disaggregation mode. The PD master node exposes WebSocket endpoints that receive binary frames and pass the data directly to pickle.loads() without authentication or validation. A remote attacker who can reach the PD master can send a crafted payload to achieve arbitrary code execution.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00962 61st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
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
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
ModelTCLightLLMup to 1.1.0—No fix listedCNA
  • LightLLM VendorModelTC Affected up to 1.1.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26220
  2. 2026-10-03 Alias added: GHSA-xxv9-73gc-96fm

References

Exploit 1

Other 4

  • TI-2026-65681 LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Visual-Only RPyC Service CVSS 4.0CRITICAL 9.3
  • TI-2026-65562 LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Embed Cache RPyC Service CVSS 4.0CRITICAL 9.3
  • TI-2026-65561 LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Router Profiler RPyC Service CVSS 4.0CRITICAL 9.3
  • TI-2026-63189 LightLLM through 1.2.0 Missing Authentication in PD Master /pd_register WebSocket Endpoint CVSS 4.0CRITICAL 9.3
  • TI-2026-61785 LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle Deserialization CVSS 4.0CRITICAL 9.3
  • TI-2026-74944 Unauthenticated denial of service in LightLLM via pd_kv_trans_params CVSS 4.0HIGH 8.7
See all 11 →

Sources

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