{"answers":{"affected":"3 open source packages ship an affected version, including transformers. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-4372 in the wild and no public exploit code.","fix":"Upgrade transformers to 5.3.0 or later.","what":"CVE-2026-4372 is a high-severity unsafe deserialization vulnerability in huggingface/transformers, published on 24 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-4372 and fix it if it is affected.\n\nWhat it is: CVE-2026-4372 is a high-severity unsafe deserialization vulnerability in huggingface/transformers, published on 24 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-4372 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- transformers (PyPI): affected all versions; fixed in 5.3.0\n- transformers (PyPI): affected all versions; fixed in 5.3.0\n- transformers (PyPI): affected all versions; fixed in 5.3.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-4372/ (Markdown: https://insights.sbomify.com/CVE-2026-4372/index.md)","id":"CVE-2026-4372","markdown":"https://insights.sbomify.com/CVE-2026-4372/index.md","name":"CVE-2026-4372","record":{"aliases":["CLSA-2026-1783386115","ECHO-f851-2f9e-9461","GHSA-29pf-2h5f-8g72","PYSEC-2026-2289"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Python ML library","requires_auth":"none","summary":"Attackers can execute arbitrary code by crafting a malicious config file that bypasses security checks when loading models in the HuggingFace transformers library.","user_interaction":"required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"@huntr_ai","cpe":[{"product":"transformers","vendor":"huggingface"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"},{"id":"CWE-1066","name":"Missing Serialization Control Element"}],"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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":"2026-10-14","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-10-14T02:18:39Z","kind":"github_poc","ref":"https://github.com/alvin21mfmlai/SE6013_Project","stars":0,"title":"CVE-2026-4372: Threat Model, Root-Cause Analysis, Replication \u0026 Detection"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Arbitrary Remote Code Execution via `_attn_implementation_internal` Config Injection in huggingface/transformers","id":"CVE-2026-4372","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"JetFormBuilder \u003c= 3.5.6.2 - Unauthenticated Arbitrary File Read via Media Field","id":"CVE-2026-4373"},"packages":[{"ecosystem":"PyPI","fixed":["5.3.0"],"introduced":["0"],"last_affected":[],"package":"transformers","purl":null,"source":"GHSA-29pf-2h5f-8g72"},{"ecosystem":"PyPI","fixed":["5.3.0"],"introduced":["0"],"last_affected":[],"package":"transformers","purl":"pkg:pypi/transformers","source":"GHSA-29pf-2h5f-8g72"},{"ecosystem":"PyPI","fixed":["5.3.0"],"introduced":["0"],"last_affected":[],"package":"transformers","purl":"pkg:pypi/transformers","source":"PYSEC-2026-2289"}],"prev":{"headline":"Out of bounds read in IMAP parsing","id":"CVE-2026-4371"},"products":["huggingface/transformers"],"published":"2026-05-24","related":[{"cvss_score":9.6,"headline":"Deserialization of Untrusted Data in huggingface/transformers","id":"CVE-2023-7018","kev_date_added":null,"published":"2023-12-20"},{"cvss_score":9,"headline":"Deserialization of Untrusted Data in huggingface/transformers","id":"CVE-2023-6730","kev_date_added":null,"published":"2023-12-19"},{"cvss_score":8.8,"headline":"Hugging Face Transformers MaskFormer Model Deserialization of Untrusted Data Remote Code Execution Vulnerability","id":"CVE-2024-11393","kev_date_added":null,"published":"2024-11-22"},{"cvss_score":8.8,"headline":"Hugging Face Transformers Trax Model Deserialization of Untrusted Data Remote Code Execution Vulnerability","id":"CVE-2024-11394","kev_date_added":null,"published":"2024-11-22"},{"cvss_score":8,"headline":"Policy Bypass in LightGlue Nested Config Resolution in huggingface/transformers","id":"CVE-2026-5241","kev_date_added":null,"published":"2026-06-03"},{"cvss_score":7.8,"headline":"Hugging Face Transformers Perceiver Model Deserialization of Untrusted Data Remote Code Execution Vulnerability","id":"CVE-2025-14920","kev_date_added":null,"published":"2025-12-23"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-05-26","vendors":["huggingface"]},"summary":"Attackers can execute arbitrary code by crafting a malicious config file that bypasses security checks when loading models in the HuggingFace transformers library.","url":"https://insights.sbomify.com/CVE-2026-4372/"}