7.5

CVE-2025-3262: Regular Expression Denial of Service (ReDoS) in huggingface/transformers

Analyzed
AliasesGHSA-489j-g2vx-39wfPYSEC-2026-1979
Published 07-07-2025Last modified 07-07-2025

Vulnerability summary

CVE-2025-3262 is a high (CVSS 7.5) vulnerability in huggingface huggingface/transformers. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 42.4% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.49%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Timeline

  1. 07-07-2025
    PublishedVulnerability first disclosed.
  2. 07-07-2025
    Last modifiedVulnerability information updated.

Description

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the huggingface/transformers repository, specifically in version 4.49.0. The vulnerability is due to inefficient regular expression complexity in the `SETTING_RE` variable within the `transformers/commands/chat.py` file. The regex contains repetition groups and non-optimized quantifiers, leading to exponential backtracking when processing 'almost matching' payloads. This can degrade application performance and potentially result in a denial-of-service (DoS) when handling specially crafted input strings. The issue is fixed in version 4.51.0.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.46% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (huntr.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Huggingface2 products
PyPI1 product
  • transformers≥ 4.49.0, < 4.51.0

2 vendors · 3 products

References

7 links