CVE-2026-4372

The record

A critical remote code execution vulnerability exists in all versions of the HuggingFace transformers library prior to version 5.3.0. The vulnerability allows an attacker to craft a malicious `config.json` file containing the `_attn_implementation_internal` field set to an attacker-controlled HuggingFace Hub repository ID. When a victim loads this model using the standard `AutoModelForCausalLM.from_pretrained()` API, the library downloads and executes arbitrary Python code from the attacker's repository with the victim's full OS privileges. This issue arises due to unfiltered deserialization of configuration attributes, insufficient sanitization of internal fields, and unsandboxed execution of downloaded kernels. The vulnerability bypasses the `trust_remote_code` security mechanism, is invisible to the victim, and exploits the standard documented usage pattern, making it particularly severe. Users are advised to upgrade to version 5.3.0 or later to mitigate this issue.

Affected packages

Related vulnerabilities

• CVE-2026-114724 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 contains an object injection… CWE-502
• CVE-2026-112081 A vulnerability was determined in hankcs HanLP up to 2.1.0-beta.64. CWE-502
• CVE-2026-96745 Deserialization of untrusted data in the command monitoring support of the MongoDB PHP… CWE-502
• CVE-2026-62107 Unauthenticated PHP Object Injection in Masteriyo - LMS <= 3.4.0 versions. CWE-502
• CVE-2026-62103 Unauthenticated PHP Object Injection in Everest Forms <= 3.6.0 versions. CWE-502
• CVE-2026-62105 Unauthenticated PHP Object Injection in ThemeREX Addons < 2.45.0 versions. CWE-502
• CVE-2026-73699 FileRun before 2026.3.0 contains a PHP object injection vulnerability that allows… CWE-502
• CVE-2026-82925 The Site Reviews WordPress plugin before 8.3.0 does not prevent request data from being… CWE-502