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Add denylist for dangerous uv sync registry-override flags in setup-python-env action #46

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Merged
pmalarme merged 2 commits into from
Feb 19, 2026
Merged

Add denylist for dangerous uv sync registry-override flags in setup-python-env action #46

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Initial plan
Copilot Feb 19, 2026
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Add denylist for dangerous uv sync registry-override flags in setup-p…
Copilot Feb 19, 2026
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5 changes: 5 additions & 0 deletions .github/actions/setup-python-env/action.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,11 @@ runs:
# Validate each whitespace-split token: must start with '-' and contain only safe flag characters.
# NOTE: '--' (end-of-options marker) is intentionally allowed; positional args would fail validation.
for arg in $EXTRA_ARGS; do
# Denylist: block flags that could redirect dependency resolution to an attacker-controlled index.
if [[ "$arg" =~ ^--(index-url|extra-index-url|trusted-host|find-links)(=|$) ]]; then
echo "::error::Blocked dangerous extra-args token: '$arg'. Registry overrides are not permitted." >&2
exit 1
fi
if [[ ! "$arg" =~ ^-[a-zA-Z0-9=._:/@+-]+$ ]]; then
echo "::error::Unsafe extra-args token: '$arg'. Each token must start with '-' and contain only safe flag characters." >&2
exit 1
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