{"id":"CVE-2026-26220","summary":"LightLLM \u003c= 1.1.0 PD Mode Unsafe Deserialization RCE","details":"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.","modified":"2026-08-12T03:51:16.745849363Z","published":"2026-02-17T01:52:03.650Z","database_specific":{"cwe_ids":["CWE-502"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26220.json","cna_assigner":"VulnCheck"},"references":[{"type":"WEB","url":"https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310"},{"type":"WEB","url":"https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331"},{"type":"WEB","url":"https://lightllm-en.readthedocs.io/en/latest/index.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26220.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26220"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce"},{"type":"REPORT","url":"https://github.com/ModelTC/LightLLM/issues/1213"},{"type":"PACKAGE","url":"https://github.com/ModelTC/lightllm"},{"type":"EVIDENCE","url":"https://chocapikk.com/posts/2026/lightllm-pickle-rce/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/modeltc/lightllm","events":[{"introduced":"0"},{"last_affected":"0f5d0ccf98b654e77fe9b0d9de81bda19cb907ad"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"1.1.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.1.0","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26220.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}