CVE-2025-3777: PYSEC-2026-1986 - Transformers's Improper Input Validation vulnerability can be exploited through username injection

CVE-2025-3777 · Severity: low · CVSS 3 · Published 2026-07-07

Transformers's Improper Input Validation vulnerability can be exploited through username injection

Technologies: transformers (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2025-3777 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-3777 being exploited in the wild.
How severe is CVE-2025-3777?
Low severity, with a CVSS score of 3, published 7 July 2026.
Which products and versions are affected?
transformers (PyPI) ECOSYSTEM:introduced=0,fixed=4.52.1.
Is there a fix for CVE-2025-3777?
Yes. transformers (PyPI): upgrade to 4.52.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-3777?
Check whether you run transformers (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • transformers (PyPI): upgrade to 4.52.1 or later
    pip install "transformers>=4.52.1"

Affected products

  • transformers (PyPI) ECOSYSTEM:introduced=0,fixed=4.52.1

Identifiers

  • CVE-2025-3777
  • GHSA-phhr-52qp-3mj4
  • PYSEC-2026-1986

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