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CVE-2025-3677
lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization
Medium4.8EPSS 0.21%
- Published
- Updated
- Reserved
- Assigned by
- VulDB
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.
Timeline
ID reserved
By VulDB
Published
- 5 days later
· 5 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulDBCNA (assigner) | 4.0 | Medium4.8 | 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 |
| VulDBCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| VulDBCNA (assigner) | 3.0 | Medium5.3 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| VulDBCNA (assigner) | 2.0 | Medium4.3 | AV:L/AC:L/Au:S/C:P/I:P/A:P |
| NVDNVD · Deferred | 4.0 | Medium4.8 | 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 |
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.8.
Weakness
Affected products
- affected 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
References (4)
- VDB-304966 | lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization (opens in a new tab)vdb-entrytechnical-description
- VDB-304966 | CTI Indicators (IOB, IOC, IOA) (opens in a new tab)signaturepermissions-required
- Submit #552755 | lm-sys FastChat v0.2.3 to v0.2.36 Deserialization (opens in a new tab)third-party-advisory
- https://github.com/lm-sys/FastChat/issues/3713 (opens in a new tab)issue-tracking
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-3677)Record last updated .