# CVE-2026-103041 — ModelTC LightLLM

> As of 2026-09-30, CVE-2026-103041 is a CRITICAL-severity vulnerability in ModelTC LightLLM, CVSS v3.1 9.8. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-103041 as of 2026-09-30; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-30

## What is CVE-2026-103041?

LightLLM through 1.2.0 multimodal deployments expose an unauthenticated RPyC cache service with pickle deserialization enabled on all interfaces. Attackers can send crafted serialized objects to exposed cache methods to execute arbitrary code with service privileges.

The record classifies CVE-2026-103041 under weakness class [CWE-502](https://intel.threadlinqs.com/cwe/CWE-502). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 6 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-29, last modified 2026-09-30

## Is CVE-2026-103041 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **ModelTC**: LightLLM

## How to fix CVE-2026-103041

No vendor patch reference has been recorded for CVE-2026-103041 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-103041

No threat campaign in the Threadlinqs corpus currently references CVE-2026-103041, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on 2026-09-30. This product uses the NVD API but is not endorsed or certified by the NVD.

**Technical analysis**

- [github.com — technical description](https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/embed_cache/manager.py#L29-L31)
- [github.com — technical description (manager)](https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/embed_cache/manager.py#L66)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code-execution-via-embed-cache-rpyc-service)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/ModelTC/LightLLM/issues/1596)
- [github.com — product](https://github.com/ModelTC/LightLLM)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-103041
Full detection coverage and IOCs for threats exploiting CVE-2026-103041 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp