What is CVE-2025-14921?

CVE-2025-14921 is a high-severity vulnerability in Hugging Face Transformers, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2025-12-23.

How severe is CVE-2025-14921?

High severity. CVSS v3 base score is 7.8 out of 10.

Deserialization in Hugging Face Transformers

CVE-2025-14921

Hugging Face Transformers Transformer-XL Model Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Hugging Face Transforme…

Vulnerability class: Insecure Deserialization

EPSS: 0.005 (65.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Hugging Face Transformers — versions 9c8bd3fc1befe54f3efb9f385561eef49f060a70

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

ZDI-25-1149 (x_research-advisory)

Frequently asked questions

What is CVE-2025-14921?: CVE-2025-14921 is a high-severity vulnerability in Hugging Face Transformers, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2025-12-23.
How severe is CVE-2025-14921?: High severity. CVSS v3 base score is 7.8 out of 10.