CVE-2025-6921
- Source
- https://cve.org/CVERecord?id=CVE-2025-6921
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-6921.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-6921
- Aliases
- Related
- Published
- 2025-09-23T13:56:15.636Z
- Modified
- 2026-07-08T07:22:30.902464951Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- Regular Expression Denial of Service (ReDoS) in huggingface/transformers
- Details
-
The huggingface/transformers library, versions prior to 4.53.0, is vulnerable to Regular Expression Denial of Service (ReDoS) in the AdamWeightDecay optimizer. The vulnerability arises from the douseweightdecay method, which processes user-controlled regular expressions in the includeinweightdecay and excludefromweightdecay lists. Malicious regular expressions can cause catastrophic backtracking during the re.search call, leading to 100% CPU utilization and a denial of service. This issue can be exploited by attackers who can control the patterns in these lists, potentially causing the machine learning task to hang and rendering services unresponsive.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/6xxx/CVE-2025-6921.json", "cna_assigner": "@huntr_ai", "cwe_ids": [ "CWE-400" ] }- References
Affected packages
Git / github.com/huggingface/transformers
Affected ranges
- Type
- GIT
- Repo
- https://github.com/huggingface/transformers
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
{ "source": [ "CPE_RANGE", "REFERENCES" ], "cpe": "cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "4.53.0" } ] }
Affected versions
0.*
0.1.2
0.5.0
1.*
1.0
1.1.0
1.2.0
3.*
3.0.1
4.*
4.3.0.rc1
v0.*
v0.1.2
v0.2.0
v0.3.0
v0.4.0
v0.5.0
v0.5.1
v0.6.0
v0.6.1
v0.6.2
v2.*
v2.0.0
v2.1.0
v2.1.1
v2.10.0
v2.11.0
v2.2.0
v2.2.1
v2.2.2
v2.3.0
v2.4.0
v2.4.1
v2.5.0
v2.5.1
v2.6.0
v2.7.0
v2.8.0
v2.9.0
v2.9.1
v3.*
v3.0.0
v3.0.1
v3.0.2
v3.1.0
v3.2.0
v3.3.0
v3.3.1
v3.4.0
v3.5.0
v4.*
v4.1.0
v4.1.1
v4.10.0
v4.11.0
v4.12.0
v4.13.0
v4.14.0
v4.15.0
v4.16.0
v4.2.0
v4.3.0.rc1
v4.33.1
v4.4.0
v4.49.0-AyaVision
v4.49.0-Mistral-3
v4.49.0-SigLIP-2
v4.49.0-SmolVLM-2
v4.5.0
v4.50.3-DeepSeek-3
v4.51.3-BitNet-preview
v4.51.3-CSM-preview
v4.51.3-D-FINE-preview
v4.51.3-GraniteMoeHybrid-preview
v4.51.3-InternVL-preview
v4.51.3-Janus-preview
v4.51.3-LlamaGuard-preview
v4.51.3-MLCD-preview
v4.51.3-Qwen2.5-Omni-preview
v4.51.3-SAM-HQ-preview
v4.51.3-TimesFM-preview
v4.52.4-ColQwen2-preview
v4.52.4-Kyutai-STT-preview
v4.52.4-VJEPA-2-preview
v4.6.0
v4.7.0
v4.8.0
v4.9.0