CVE-2026-1839: HuggingFace Transformers Arbitrary Code Execution in Trainer
Transformers
The Trainer class in HuggingFace Transformers calls torch.load without weights_only=True, allowing arbitrary code execution. Attackers can exploit this via malicious checkpoint files.
disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why
- CVSS
- 6.5
- EPSS
- <0.01 · top 67% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 7 Apr 2026
- last update
- 7 Apr 2026
- CVE ids
Timeline · 1
Sources · 1
Advisories and databases
- 2026-04-07CVE-2026-1839: HuggingFace Transformers allows for arbitrary code execution in the `Trainer` classGitHub Advisory Database · github.com/advisories/GHSA-69w3-r845-3855
Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.
Classification
- lane
- Patch now
- AI role
- Attack on AI
- categories
- Infrastructure vulnerabilitySupply chain
- severity
- 2 · Disclosed vulnerability
- fix status
- Fix status unknown
- targets
- Framework / tooling
- owasp llm top 10
- LLM03:2025 Supply Chain
- mitre atlas
- AML.T0010 AI Supply Chain Compromise
- dates
- happened 7 Apr 2026 · first reported 7 Apr 2026
- origin
- GitHub Advisory DatabaseVulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
- record
- confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 07:00Z
Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned
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the brief as text
# CVE-2026-1839: HuggingFace Transformers Arbitrary Code Execution in Trainer https://gcdradar.vercel.app/incidents/cve-2026-1839-huggingface-transformers-arbitrary-code-execut · AIR-2026-0558 · closed 2026-04-07 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2026-04-07 - AI role: Attack on AI - Products: Transformers - CVE ids: CVE-2026-1839 - CVSS: 6.5 ## Summary The Trainer class in HuggingFace Transformers calls torch.load without weights_only=True, allowing arbitrary code execution. Attackers can exploit this via malicious checkpoint files. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2026-04-07: CVE-2026-1839: HuggingFace Transformers allows for arbitrary code execution in the `Trainer` class (https://github.com/advisories/GHSA-69w3-r845-3855) ## Sources - 2026-04-07 GitHub Advisory Database: CVE-2026-1839: HuggingFace Transformers allows for arbitrary code execution in the `Trainer` class https://github.com/advisories/GHSA-69w3-r845-3855 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
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