CVE-2025-3677 | THREATINT

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.

In lm-sys fastchat bis 0.2.36 wurde eine Schwachstelle entdeckt. Sie wurde als kritisch eingestuft. Das betrifft die Funktion split_files/apply_delta_low_cpu_mem der Datei fastchat/model/apply_delta.py. Mit der Manipulation mit unbekannten Daten kann eine deserialization-Schwachstelle ausgenutzt werden. Die Umsetzung des Angriffs hat dabei lokal zu erfolgen.

Reserved 2025-04-16 | Published 2025-04-16 | Updated 2025-04-21 | Assigner VulDB

MEDIUM: 4.8CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

MEDIUM: 5.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

MEDIUM: 5.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

4.3AV:L/AC:L/Au:S/C:P/I:P/A:P

Problem types

Deserialization

Improper Input Validation

Product status

0.2.0

affected

0.2.1

affected

0.2.2

affected

0.2.3

affected

0.2.4

affected

0.2.5

affected

0.2.6

affected

0.2.7

affected

0.2.8

affected

0.2.9

affected

0.2.10

affected

0.2.11

affected

0.2.12

affected

0.2.13

affected

0.2.14

affected

0.2.15

affected

0.2.16

affected

0.2.17

affected

0.2.18

affected

0.2.19

affected

0.2.20

affected

0.2.21

affected

0.2.22

affected

0.2.23

affected

0.2.24

affected

0.2.25

affected

0.2.26

affected

0.2.27

affected

0.2.28

affected

0.2.29

affected

0.2.30

affected

0.2.31

affected

0.2.32

affected

0.2.33

affected

0.2.34

affected

0.2.35

affected

0.2.36

affected

Timeline

2025-04-16:	Advisory disclosed
2025-04-16:	VulDB entry created
2025-04-21:	VulDB entry last update

Credits

ybdesire (VulDB User) reporter

ybdesire (VulDB User) analyst

References

vuldb.com/?id.304966 (VDB-304966 | lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization) vdb-entry technical-description

vuldb.com/?ctiid.304966 (VDB-304966 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.552755 (Submit #552755 | lm-sys FastChat v0.2.3 to v0.2.36 Deserialization) third-party-advisory

github.com/lm-sys/FastChat/issues/3713 issue-tracking

cve.org (CVE-2025-3677)

nvd.nist.gov (CVE-2025-3677)

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