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CVE-2026-44723: Vowpal Wabbit is a machine learning system

33
Routine
MEDIUM 5.0UPGRADE

CVE-2026-44723 is a medium-severity flaw (CVSS 5.0) affecting vowpal wabbit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score5.0 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.5% (top 60%)
CISA exploited listNo
WeaknessCWE-78, CWE-1336
Published2026-05-26
Last modified2026-07-24
Publisher (CNA): GitHub, Inc. · Vendor: vowpalwabbit

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Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

vowpalwabbit vowpal wabbit UPGRADE
Affected: < 2026-05-04
Fixed in: 2026-05-04
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy vowpal-wabbit || rpm -q vowpal-wabbit || vowpal-wabbit --version
2. UPGRADE to 2026-05-04 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade vowpal-wabbit
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade vowpal-wabbit
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44723?

vowpal wabbit: upgrade to 2026-05-04. Exact commands for each OS are on this page.

Is CVE-2026-44723 being exploited?

CVE-2026-44723 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44723 affect?

CVE-2026-44723 affects vowpal wabbit. Severity is medium (CVSS 5.0). 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 a

How urgent is CVE-2026-44723?

Priority 33/100. Public exploit reference

Software pages

Python vulnerabilities · GitHub vulnerabilities

References

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