{"id":"CVE-2026-44513","title":"Diffusers is the a library for  pretrained diffusion models","summary":"Diffusers is the a library for  pretrained diffusion models. Prior to 0.38.0, a trust_remote_code bypass in DiffusionPipeline.from_pretrained allows arbitrary remote code execution despite the user passing trust_remote_code=False (or omi…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-94","CWE-358"],"vendor":"huggingface","product":"diffusers","affected":["diffusers < 0.38.0"],"patched":["diffusers 0.38.0"],"published":"2026-05-14","updated":"2026-08-28","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44513","references":[{"url":"https://github.com/huggingface/diffusers/security/advisories/GHSA-98h9-4798-4q5v","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:60520","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-44513","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477507","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44513.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44513"},{"url":"https://github.com/huggingface/diffusers/issues/13446"},{"url":"https://github.com/huggingface/diffusers/pull/13448"},{"url":"https://github.com/huggingface/diffusers/commit/a37f6f8394ac2a7ee8360c3abea811efe54512b1"},{"url":"https://github.com/huggingface/diffusers"},{"url":"https://github.com/huggingface/diffusers/releases/tag/v0.38.0"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/diffusers/PYSEC-2026-40.yaml"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-44513"},{"url":"https://access.redhat.com/errata/RHSA-2026:69466"},{"url":"https://access.redhat.com/errata/RHSA-2026:69467"}],"tags":["nvd","osv","pip","csaf","vex","red-hat"],"epss":0.01071,"epssPercentile":0.63426,"ingestedAt":"2026-08-29T00:27:52.829Z","aliases":["GHSA-98h9-4798-4q5v","PYSEC-2026-40"],"ecosystem":"pip","slug":"CVE-2026-44513","body":"## Overview\n\nDiffusers is the a library for  pretrained diffusion models. Prior to 0.38.0, a trust_remote_code bypass in DiffusionPipeline.from_pretrained allows arbitrary remote code execution despite the user passing trust_remote_code=False (or omitting it, which is the default). The vulnerability has three variants, all sharing the same root cause — the trust_remote_code gate was implemented inside DiffusionPipeline.download() rather than at the actual dynamic-module load site, so any code path that bypassed or short-circuited download() also bypassed the security check. DiffusionPipeline.from_pretrained('repoA', custom_pipeline='attacker/repoB', trust_remote_code=False) — the gate evaluated against repoA's file list rather than repoB's, so repoB's pipeline.py was loaded and executed. DiffusionPipeline.from_pretrained('/local/snapshot', custom_pipeline='attacker/repoB', trust_remote_code=False) — the local-path branch never invoked download(), so the gate was never reached and remote code from repoB executed. DiffusionPipeline.from_pretrained('/local/snapshot', trust_remote_code=False) where the snapshot contains custom component files (e.g. unet/my_unet_model.py) referenced from model_index.json — same root cause; the local path skipped download() and custom component code executed. This vulnerability is fixed in 0.38.0.\n\n## Affected\n\n- `diffusers < 0.38.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `diffusers 0.38.0`\n\n## Package advisory (CVE-2026-44513)\n\nAffected packages:\n\n- `diffusers < 0.38.0`\n\nPatched in:\n\n- `diffusers 0.38.0`\n\nSource: https://osv.dev/vulnerability/GHSA-98h9-4798-4q5v\n\n## Vendor advisories\n\n- **RHSA-2026:69466** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69466)\n- **RHSA-2026:69467** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69467)\n- **RHSA-2026:60520** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-08-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:60520)\n- **Red Hat VEX** · Important · affected: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44513.json)","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}