{"cve":"CVE-2026-3449","nvd":{"published":"2026-03-03T05:17:25.017","modified":"2026-06-17T10:43:36.317","status":"Deferred","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.","cvss_v4":{"vector":"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","score":1.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","score":3.3},"cwes":["CWE-705"],"references":["https://github.com/TooTallNate/once/commit/b9f43cc5259bee2952d91ad3cdbd201a82df448a","https://github.com/TooTallNate/once/issues/8","https://security.snyk.io/vuln/SNYK-JS-TOOTALLNATEONCE-15250612"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-3449","score":0.00128,"percentile":0.02454,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vpq2-c234-7xj6","url":"https://osv.dev/vulnerability/GHSA-vpq2-c234-7xj6","summary":"@tootallnate/once vulnerable to Incorrect Control Flow Scoping","modified":"2026-09-10T03:51:00.790088103Z","packages":[{"ecosystem":"npm","name":"@tootallnate/once","purl":"pkg:npm/%40tootallnate/once","ranges":[">=3.0.0 <3.0.1"],"fixed":["3.0.1"]},{"ecosystem":"npm","name":"@tootallnate/once","purl":"pkg:npm/%40tootallnate/once","ranges":["<2.0.1"],"fixed":["2.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}