Deserialization in Modeltc Lightllm
CVE-2026-103040
LightLLM through 1.2.0 contains a remote code execution vulnerability in the router profiler service when started with --enable_profiling flag. The service exposes an unauthenticated RPyC server with pickle deserialization enabled, allowing attackers to execute arbitrary code by sending crafted serialized objects to the profiler command queue.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ModelTC/LightLLM/issues/1597 (issue-tracking)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/profiler_service… (technical-description)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/profiler_service… (technical-description)
- github.com/ModelTC/LightLLM (product)
- www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103040?
- CVE-2026-103040 is a critical-severity vulnerability in Modeltc Lightllm, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-09-29.
- How severe is CVE-2026-103040?
- Critical severity. CVSS v3 base score is 9.8 out of 10.