Medium
lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-3677
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 05:00 UTC · Revision 1
Source evidence
lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization
core-osv · Original sourcePublished 16 Apr 2025, 08:31 UTC
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.
osv:CVE-2025-3677
Complete source record
{
"id": "cc42386b86132087a120f0ffcfd4f185a0158aa4803108c437940fdb7d20722e",
"url": "https://osv.dev/vulnerability/CVE-2025-3677",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization",
"summary": "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.",
"evidence": "osv:CVE-2025-3677",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-3677",
"aliases": [
"CVE-2025-3677"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/lm-sys/fastchat",
"type": "GIT",
"events": [
{
"introduced": "074f0b18155a81158dacbcba7db68807d14cb471"
},
{
"last_affected": "b21d0f780ca4472a13714262a0790f2ee1ade659"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0.2.1"
},
{
"last_affected": "0.2.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.3"
},
{
"last_affected": "0.2.3"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.5"
},
{
"last_affected": "0.2.5"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.9"
},
{
"last_affected": "0.2.9"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.14"
},
{
"last_affected": "0.2.14"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.18"
},
{
"last_affected": "0.2.18"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.21"
},
{
"last_affected": "0.2.21"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.22"
},
{
"last_affected": "0.2.22"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.23"
},
{
"last_affected": "0.2.23"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.24"
},
{
"last_affected": "0.2.24"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.25"
},
{
"last_affected": "0.2.25"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.26"
},
{
"last_affected": "0.2.26"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.27"
},
{
"last_affected": "0.2.27"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.28"
},
{
"last_affected": "0.2.28"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.29"
},
{
"last_affected": "0.2.29"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.30"
},
{
"last_affected": "0.2.30"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.31"
},
{
"last_affected": "0.2.31"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.32"
},
{
"last_affected": "0.2.32"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.33"
},
{
"last_affected": "0.2.33"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.34"
},
{
"last_affected": "0.2.34"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.35"
},
{
"last_affected": "0.2.35"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0.2.36"
},
{
"last_affected": "0.2.36"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "0.2.36"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"0.2.1",
"0.2.14",
"0.2.18",
"0.2.21",
"0.2.22",
"0.2.23",
"0.2.24",
"0.2.25",
"0.2.26",
"0.2.27",
"0.2.28",
"0.2.29",
"0.2.3",
"0.2.30",
"0.2.31",
"0.2.32",
"0.2.33",
"0.2.34",
"0.2.35",
"0.2.36",
"0.2.5",
"0.2.9",
"v0.2.36",
"v0.2.35",
"v0.2.34",
"v0.2.33",
"v0.2.32",
"v0.2.31",
"v0.2.30",
"v0.2.29",
"v0.2.28",
"v0.2.27",
"v0.2.26",
"v0.2.25",
"v0.2.23",
"v0.2.22",
"v0.2.21",
"v0.2.18",
"v0.2.14",
"v0.2.9",
"v0.2.5",
"v0.2.3",
"v0.2.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-3677.json"
}
}
],
"modified": "2026-10-28T02:30:33.368473321Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/3xxx/CVE-2025-3677.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-3677",
"https://vuldb.com/?id.304966",
"https://vuldb.com/?submit.552755",
"https://github.com/lm-sys/FastChat/issues/3713",
"https://vuldb.com/?ctiid.304966"
],
"provider_metadata": {
"cwe_ids": [
"CWE-20",
"CWE-502"
],
"cna_assigner": "VulDB",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "0.2.0"
},
{
"last_affected": "0.2.0"
},
{
"introduced": "0.2.2"
},
{
"last_affected": "0.2.2"
},
{
"introduced": "0.2.4"
},
{
"last_affected": "0.2.4"
},
{
"introduced": "0.2.6"
},
{
"last_affected": "0.2.6"
},
{
"introduced": "0.2.7"
},
{
"last_affected": "0.2.7"
},
{
"introduced": "0.2.8"
},
{
"last_affected": "0.2.8"
},
{
"introduced": "0.2.10"
},
{
"last_affected": "0.2.10"
},
{
"introduced": "0.2.11"
},
{
"last_affected": "0.2.11"
},
{
"introduced": "0.2.12"
},
{
"last_affected": "0.2.12"
},
{
"introduced": "0.2.13"
},
{
"last_affected": "0.2.13"
},
{
"introduced": "0.2.15"
},
{
"last_affected": "0.2.15"
},
{
"introduced": "0.2.16"
},
{
"last_affected": "0.2.16"
},
{
"introduced": "0.2.17"
},
{
"last_affected": "0.2.17"
},
{
"introduced": "0.2.19"
},
{
"last_affected": "0.2.19"
},
{
"introduced": "0.2.20"
},
{
"last_affected": "0.2.20"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/3xxx/CVE-2025-3677.json"
}
},
"related_cves": [
{
"value": "CVE-2025-3677",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 500421,
"published_at": "2025-04-16T08:31:04.475+00:00"
}