PYSEC-2026-1982

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/transformers/PYSEC-2026-1982.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1982
Aliases
Published
2026-07-07T14:34:53Z
Modified
2026-07-07T17:48:13Z
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
Transformers Regular Expression Denial of Service (ReDoS) vulnerability
Details

A Regular Expression Denial of Service (ReDoS) vulnerability was identified in the huggingface/transformers library, specifically in the file tokenization_nougat_fast.py. The vulnerability occurs in the post_process_single() function, where a regular expression processes specially crafted input. The issue stems from the regex exhibiting exponential time complexity under certain conditions, leading to excessive backtracking. This can result in significantly high CPU usage and potential application downtime, effectively creating a Denial of Service (DoS) scenario. The affected version is v4.46.3.

References

Affected packages

PyPI / transformers

Package

Name
transformers
View open source insights on deps.dev
Purl
pkg:pypi/transformers

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.48.0

Affected versions

0.*
0.1
2.*
2.0.0
2.1.0
2.1.1
2.2.0
2.2.1
2.2.2
2.3.0
2.4.0
2.4.1
2.5.0
2.5.1
2.6.0
2.7.0
2.8.0
2.9.0
2.9.1
2.10.0
2.11.0
3.*
3.0.0
3.0.1
3.0.2
3.1.0
3.2.0
3.3.0
3.3.1
3.4.0
3.5.0
3.5.1
4.*
4.0.0rc1
4.0.0
4.0.1
4.1.0
4.1.1
4.2.0
4.2.1
4.2.2
4.3.0rc1
4.3.0
4.3.1
4.3.2
4.3.3
4.4.0
4.4.1
4.4.2
4.5.0
4.5.1
4.6.0
4.6.1
4.7.0
4.8.0
4.8.1
4.8.2
4.9.0
4.9.1
4.9.2
4.10.0
4.10.1
4.10.2
4.10.3
4.11.0
4.11.1
4.11.2
4.11.3
4.12.0
4.12.1
4.12.2
4.12.3
4.12.4
4.12.5
4.13.0
4.14.0
4.14.1
4.15.0
4.16.0
4.16.1
4.16.2
4.17.0
4.18.0
4.19.0
4.19.1
4.19.2
4.19.3
4.19.4
4.20.0
4.20.1
4.21.0
4.21.1
4.21.2
4.21.3
4.22.0
4.22.1
4.22.2
4.23.0
4.23.1
4.24.0
4.25.0
4.25.1
4.26.0
4.26.1
4.27.0
4.27.1
4.27.2
4.27.3
4.27.4
4.28.0
4.28.1
4.29.0
4.29.1
4.29.2
4.30.0
4.30.1
4.30.2
4.31.0
4.32.0
4.32.1
4.33.0
4.33.1
4.33.2
4.33.3
4.34.0
4.34.1
4.35.0
4.35.1
4.35.2
4.36.0
4.36.1
4.36.2
4.37.0
4.37.1
4.37.2
4.38.0
4.38.1
4.38.2
4.39.0
4.39.1
4.39.2
4.39.3
4.40.0
4.40.1
4.40.2
4.41.0
4.41.1
4.41.2
4.42.0
4.42.1
4.42.2
4.42.3
4.42.4
4.43.0
4.43.1
4.43.2
4.43.3
4.43.4
4.44.0
4.44.1
4.44.2
4.45.0
4.45.1
4.45.2
4.46.0
4.46.1
4.46.2
4.46.3
4.47.0
4.47.1

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/transformers/PYSEC-2026-1982.yaml"