{"id":"CVE-2025-3677","aliases":["EUVD-2025-11794","GHSA-v32v-5787-25w8"],"status":"published","title":"lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization","description":"A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.","severity":{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0021,"percentile":0.1126,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20","CWE-502"],"published":"2025-04-16T08:31:04Z","modified":"2026-10-28T02:30:33Z","products":[{"vendor":"lm-sys","product":"fastchat"}],"references":[{"url":"https://vuldb.com/?id.304966","tags":["vdb-entry","technical-description","advisory"]},{"url":"https://vuldb.com/?ctiid.304966","tags":["signature","permissions-required","report"]},{"url":"https://vuldb.com/?submit.552755","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/lm-sys/FastChat/issues/3713","tags":["issue-tracking","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-3677","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-v32v-5787-25w8"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/3xxx/CVE-2025-3677.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-3677","title":"lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization","description":"A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.","status":"published","published":"2025-04-16T08:31:04.475Z","modified":"2025-04-21T11:28:25.222Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"},{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"},{"version":"2.0","score":4.3,"vector":"AV:L/AC:L/Au:S/C:P/I:P/A:P","assessor":"cna"}],"cwes":["CWE-502","CWE-20"],"updated_at":"2026-11-02T14:32:39.719629Z"}],"euvd":[{"id":"EUVD-2025-11794","description":"A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.","status":"published","published":"2025-04-16T08:31:04Z","modified":"2025-04-21T11:28:25Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T20:52:19.235376Z"}],"ghsa":[{"id":"GHSA-v32v-5787-25w8","title":"A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This...","description":"A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.","status":"published","published":"2025-04-16T09:32:14Z","modified":"2025-04-16T09:32:25Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:01:34.355264Z"}],"nvd":[{"id":"CVE-2025-3677","description":"A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.","status":"published","published":"2025-04-16T09:15:28.273Z","modified":"2026-06-17T09:20:27.8Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"2.0","score":4.3,"vector":"AV:L/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"secondary"}],"cwes":["CWE-20","CWE-502"],"updated_at":"2026-11-02T14:11:00.456643Z"}],"osv":[{"id":"CVE-2025-3677","title":"lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization","description":"A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.","status":"published","published":"2025-04-16T08:31:04.475Z","modified":"2026-10-28T02:30:33.368473321Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-20","CWE-502"],"updated_at":"2026-11-02T15:44:48.342824Z"}]}}