CVE-2015-8968: Squareup Git-Fastclone

High severity, CVSS 8.8. EPSS: 5.2% chance of exploitation in the next 30 days.

git-fastclone before 1.0.1 permits arbitrary shell command execution from .gitmodules. If an attacker can instruct a user to run a recursive clone from a repository they control, they can get a client to run an arbitrary shell command. Alternately, if an attacker can MITM an unencrypted git clone, they could exploit this. The ext command will be run if the repository is recursively cloned or if submodules are updated. This attack works when cloning both local and remote repositories.

Affected products

• Squareup Git-Fastclone: before 1.0.1 (fixed in 1.0.1)

Published 2016-11-03. Last modified 2026-06-17.