# CVE-2026-3449

## Summary

- **CVE ID:** CVE-2026-3449
- **Severity:** MEDIUM
- **CVSS Score:** 4.8 (CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P)
- **CWE:** CWE-705
- **Published:** Mar 3, 2026
- **Last Modified:** May 4, 2026

## 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 Products

- n/a — @tootallnate/once (0)
- npm — @tootallnate/once (< 3.0.1)

## References

- [CNA](https://security.snyk.io/vuln/SNYK-JS-TOOTALLNATEONCE-15250612)
- [CNA](https://github.com/TooTallNate/once/issues/8)
- [CNA](https://github.com/TooTallNate/once/commit/b9f43cc5259bee2952d91ad3cdbd201a82df448a)
- [GitHub](https://github.com/advisories/GHSA-vpq2-c234-7xj6)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.11%
- **EPSS Percentile:** 1.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._