CVE-2026-44723: Vowpal Wabbit is a machine learning system. The workflow .github/workflows/python_checks.yml embeds ${{ github.event.pull_request.title }} directly inside…

PriorityP264critical9.9CVSS 3.1

AVNACLPRLUINSCCHIHAH

EPSS

0.47%

37.1th percentile

Vowpal Wabbit is a machine learning system. The workflow .github/workflows/python_checks.yml embeds ${{ github.event.pull_request.title }} directly inside double-quoted bash strings in four separate steps across four jobs, each passing it as a CLI argument to the Python test script run_tests_model_gen_and_load.py. The shell interprets the expanded string before invoking Python, allowing an attacker to break out of the quotes and execute arbitrary commands on the runner. The pull_request trigger fires on PRs targeting any branch (branches: ['*']), with no additional access gate. This vulnerability is fixed by the 998e390e80a7e8192d7849b7784bc113dbd190ad commit.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
vowpalwabbit	vowpal_wabbit	< 998e390e80a7e8192d7849b7784bc113dbd190ad	998e390e80a7e8192d7849b7784bc113dbd190ad
vowpalwabbit	vowpal_wabbit	< 2026-05-04	2026-05-04

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