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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.

PUBLISHED Reserved 2026-03-02 | Published 2026-03-03 | Updated 2026-03-03 | Assigner snyk




MEDIUM: 4.8CVSS: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
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P

Problem types

Incorrect Control Flow Scoping

Credits

Nanak Singh Khurana

References

security.snyk.io/vuln/SNYK-JS-TOOTALLNATEONCE-15250612

github.com/TooTallNate/once/issues/8

github.com/...ommit/b9f43cc5259bee2952d91ad3cdbd201a82df448a

cve.org (CVE-2026-3449)

nvd.nist.gov (CVE-2026-3449)

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