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jupyterlab/maintainer-tools/update-snapshots-checkoutGHSL-2026-203: Same-second TOCTOU vulnerability in jupyterlab/maintainer-tools update-snapshots-checkout - CVE-2026-84973

Risk 73

The jupyterlab/maintainer-tools update-snapshots-checkout action uses one-second timestamps to reject pull request updates after an authorized comment. An attacker can win a same-second race, causing a privileged workflow to check out and execute attacker-controlled code.

First published (updated )
CVE-2026-84973

jupyterlab/maintainer-tools/update-snapshots-checkoutSame-second TOCTOU vulnerability in jupyterlab/maintainer-tools update-snapshots-checkout - CVE-2026-84973

Risk 73

The jupyterlab/maintainer-tools update-snapshots-checkout action uses one-second timestamps to reject pull request updates after an authorized comment. An attacker can win a same-second race, causing a privileged workflow to check out and execute attacker-controlled code.

First published (updated )
Advisory
GHSL-2026-203

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