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Vulnerability · Published Apr 16, 2025 · Assigned by VulDB

CVE-2025-3677lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization

Medium 5.3

In plain English

A medium-severity unsafe deserialization in fastchat from lm-sys. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 89.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
lm-sys fastchat 0.2.00.2.10.2.20.2.30.2.40.2.50.2.60.2.7

Weakness: CWE-502, CWE-20 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References