Incorrect Control Flow Scoping Affecting @tootallnate/once package, versions <2.0.1>=3.0.0 <3.0.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-TOOTALLNATEONCE-15250612
- published2 Mar 2026
- disclosed2 Feb 2026
- creditNanak Singh Khurana
Introduced: 2 Feb 2026
CVE-2026-3449 (opens in a new tab)How to fix?
Upgrade @tootallnate/once to version 2.0.1, 3.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Control Flow Scoping in promise resolving when AbortSignal option is used. The Promise remains in a permanently pending state after the signal is aborted, causing any await or .then() usage to hang indefinitely. This can cause a control-flow leak that can lead to stalled requests, blocked workers, or degraded application availability.