Vulnerability · Published Mar 3, 2026 · Assigned by snyk
CVE-2026-3449
Low 3.3
In plain English
A low-severity security flaw in @tootallnate/once. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Versions of the package @tootallnate/once before 3.0.1 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @tootallnate/once | 3.0.1 | GHSA-vpq2-c234-7xj6 |
| npm | @tootallnate/once | 2.0.1 | GHSA-vpq2-c234-7xj6 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | @tootallnate/once | 0 – before 3.0.1 |
Weakness: CWE-705 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P