Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
huggingface huggingface/transformers — Arbitrary Remote Code Execution via `_attn_implementation_internal` Config Injection in huggingface/transformers
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L N R U H H H 7.8 .0048 39.5 —
AFFECTED
Product Versions Fixed
huggingface/transformers unspecified – —
TIMELINE
Mar 18 Reserved by @huntr_ai
May 24 EXPLOIT PUBLISHED — CVE-2026-4372 (huggingface/transformers). Public exploit reference added.
May 24 Published (CNA: @huntr_ai)
Description
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| March 18, 2026 | Reserved | Reserved by @huntr_ai |
| May 24, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-4372 (huggingface/transformers). Public exploit reference added. |
| May 24, 2026 | Published | Published (CNA: @huntr_ai) |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| huggingface | huggingface/transformers | — | unspecified | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-4372 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.