CVE-2026-26220Public exploitNetwork attack vector

Unauthenticated code execution via PD WebSocket deserialization

Published Feb 17, 2026 · Updated Feb 17, 2026

Unsafe deserialization in ModelTC LightLLM 1.1.0 and earlier allows remote attackers to execute code through PD WebSockets. The /pd_register and /kv_move_status handlers accept binary frames without authentication and pass them directly to pickle.loads(). Reachability requires a network-accessible instance running prefill, decode, or pd_master mode; crafted pickle opcodes execute with the server process's privileges.

CVSS severity9.3
Critical
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in ModelTC LightLLM 1.1.0 and earlier allows remote attackers to execute code through PD WebSockets. The /pd_register and /kv_move_status handlers accept binary frames without authentication and pass them directly to pickle.loads(). Reachability requires a network-accessible instance running prefill, decode, or pd_master mode; crafted pickle opcodes execute with the server process's privileges.

The record

CVE
CVE-2026-26220
Published
Feb 17, 2026
Updated
Feb 17, 2026
Vendor
ModelTC
Product
LightLLM
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ModelTC · LightLLMversion=0 <=1.1.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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