CVE Explorer
CVE-2026-9856
A vulnerability in huggingface/transformers versions <=5.8.0.dev0 allows an attacker to perform arbitrary file writes via path traversal. The issue resides in the `save_pretrained()` methods of `PreTrainedTokenizerBase` and `ProcessorMixin`, where keys from the `chat_template` dictionary are used directly as filenames without proper validation. An attacker can exploit this by publishing a malicious Hugging Face Hub repository with a crafted `tokenizer_config.json` file. When a victim downloads a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"huggingface/transformers","vendor":"huggingface","versions":[{"lessThan":"5.10.0","status":"affected","version":"unspecified","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:79f833939d77ef541a725801fdc0a5c25ce85593e5d0abd36da73e497d2f76f7 · sha256:1d5776dbf16ad7d6… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L","version":"3.0"},"metric_type":"cvssV3_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:79f833939d77ef541a725801fdc0a5c25ce85593e5d0abd36da73e497d2f76f7 · sha256:1d5776dbf16ad7d6… · /containers/cna/metrics/0/cvssV3_0
CWE assertions
1 source assertion{"cweId":"CWE-22","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:79f833939d77ef541a725801fdc0a5c25ce85593e5d0abd36da73e497d2f76f7 · sha256:1d5776dbf16ad7d6… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"url":"https://github.com/huggingface/transformers/commit/eaaaf8494dd5386634ae37d1d122212fdc315be5"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:79f833939d77ef541a725801fdc0a5c25ce85593e5d0abd36da73e497d2f76f7 · sha256:1d5776dbf16ad7d6… · /containers/cna/references/1
{"url":"https://huntr.com/bounties/362824d5-fe18-40e8-a6cf-62277f97a170"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:79f833939d77ef541a725801fdc0a5c25ce85593e5d0abd36da73e497d2f76f7 · sha256:1d5776dbf16ad7d6… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.